Find Velocity: Help Solve Ball Problem

  • Thread starter Thread starter Prasun-rick
  • Start date Start date
  • Tags Tags
    Velocity
AI Thread Summary
A problem is presented where a ball is thrown downward with an initial velocity of 5 m/s, and a second ball must be thrown downward after 2 seconds to hit the first ball in another 2 seconds. The discussion clarifies that both balls are thrown downward, contradicting an initial misunderstanding that the second ball was thrown upward. Participants emphasize the importance of calculating the distance traveled by both balls to determine the necessary velocity for the second ball. The original poster eventually realizes they can equalize the distances to solve the problem. The conversation highlights the need for a structured approach to physics problems, including showing work and following forum rules.
Prasun-rick
Messages
31
Reaction score
0
So the question which is troubling me is as follows:
A ball is thrown vertically down with velocity of 5 m/s.With what velocity should another ball be thrown down after 2 seconds so that it can hit the 1st ball in next 2 seconds.

I couldn't ses the way out..as I feel the height of the 1st ball should be given...but I know I can be wrong..so please help me ..and thanks in advance.
 
Physics news on Phys.org
The balls are thrown from the same spot. It doesn't matter how high that spot is above the ground as long as the spot is high enough that the first ball can be in flight for the required time before the second ball hits it. How long will the first ball have been in flight before the second ball hits it?
 
TSny said:
The balls are thrown from the same spot. It doesn't matter how high that spot is above the ground as long as the spot is high enough that the first ball can be in flight for the required time before the second ball hits it. How long will the first ball have been in flight before the second ball hits it?
welll...as far as I understood...the first ball was thrown vertically downwards and the second vertically upwards...and coming to your question the first ball would have stayed 4 sec in flight before the second one hits it...I guess :)
 
Prasun-rick said:
welll...as far as I understood...the first ball was thrown vertically downwards and the second vertically upwards...and coming to your question the first ball would have stayed 4 sec in flight before the second one hits it...I guess :)
But how to solve after that??..please help!
 
Prasun-rick said:
welll...as far as I understood...the first ball was thrown vertically downwards and the second vertically upwards...
The problem states that both balls are thrown downward.
and coming to your question the first ball would have stayed 4 sec in flight before the second one hits it...I guess :)
Yes. Good. What can you calculate that would be helpful in answering the question?
 
  • Like
Likes Prasun-rick
Prasun-rick said:
welll...as far as I understood...the first ball was thrown vertically downwards and the second vertically upwards...and coming to your question the first ball would have stayed 4 sec in flight before the second one hits it...I guess :)

Why do you claim that the second ball is thrown upwards. The question says, very clearly "... another ball be thrown down... "--so thrown down, not up.
 
TSny said:
The problem states that both balls are thrown downward.
Yes. Good. What can you calculate that would be helpful in answering the question?
Well yes...sorry It was my fault...indeed the second was thrown downwards too...
And I think I can calculate the distance they have traveled and also their final velocities !
 
Prasun-rick said:
And I think I can calculate the distance they have traveled and also their final velocities !
OK
 
Ray Vickson said:
Why do you claim that the second ball is thrown upwards. The question says, very clearly "... another ball be thrown down... "--so thrown down, not up.
yess...very sorry...It was my fault..I kept having a delusion that it was thrown upwards
 
  • #10
TSny said:
OK
okay...then what to do?..Please help me out !..Should I equalise their distance travelled??..Will that be helpful?
 
  • #11
You said you could calculate the distance traveled. Please show your work.

Note: Homework helpers are required to obey the Forum rules. One of the rules is not to help until the poster has filled out the template and shown some attempt at solving the problem. So, I'm already verging on getting fired here :oldsmile:
 
  • #12
TSny said:
You said you could calculate the distance traveled. Please show your work.

Note: Homework helpers are required to obey the Forum rules. One of the rules is not to help until the poster has filled out the template and shown some attempt at solving the problem. So, I'm already verging on getting fired here :oldsmile:
okay thank you...I figured it out ..I just equalized the two distance !
 
  • #13
Prasun-rick said:
okay thank you...I figured it out ..I just equalized the two distance !
Good work!
 

Similar threads

A ball is thrown w/initial speed vi at an angle 𝜃i with the horizontal
Replies
5
Views
1K
Ambiguous question on momentum and how it works...
Replies
13
Views
1K
Projectile Motion Problem: Kicking a soccer ball over a fence
Replies
11
Views
2K
Question About Momentum: Ball Rolling up a Curved Ramp
Replies
12
Views
1K
Oblique soccer shot calculation task
Replies
38
Views
3K
Projectile motion: Two Balls and Building
Replies
9
Views
2K
Solving a Ball Thrown off a Cliff: How Long Does it Take?
Replies
4
Views
2K
Determine initial velocity of a vertical throw
Replies
11
Views
3K
Ball on a string thrown around a spool
Replies
3
Views
832
Two balls, dropped with a delay of ##\Delta t##, meet after rebound
Replies
34
Views
2K

Hot Threads

Recent Insights

Back
Top