Calculating Speed and Height of a Thrown Ball

AI Thread Summary
In the discussion about calculating the speed and height of a thrown ball, participants clarify that while the vertical component of velocity is zero at the highest point, the horizontal component remains constant. The problem involves a 0.20 kg ball thrown at 13 m/s and 32 degrees, prompting questions about using conservation of energy to find the maximum height and speed at the peak. There is confusion regarding the kinematic equations and the application of mechanical energy principles. Ultimately, understanding that projectile motion consists of both free fall and constant horizontal velocity is essential for solving the problem. The conversation emphasizes the importance of distinguishing between vertical and horizontal motion in projectile dynamics.
12boone
Messages
21
Reaction score
0

Homework Statement


A 0.20KG ball is thrown with a speed of 13 m/s at an angle of 32 degrees.

What is the speed at the highest point?

How high does it go? (Use conservation of energy, and ignores air resistance


Homework Equations



I think the kinematic equations but I am not sure.

The Attempt at a Solution



I was positive that the velocity of any projectile at the highest point would be zero, but this was not right in this problem. I think the problem has something to do with mechanical energy but I am not sure. Any suggestions for A? so that I can maybe find B.
 
Physics news on Phys.org
12boone said:

Homework Statement


A 0.20KG ball is thrown with a speed of 13 m/s at an angle of 32 degrees.

What is the speed at the highest point?

How high does it go? (Use conservation of energy, and ignores air resistance


Homework Equations



I think the kinematic equations but I am not sure.

The Attempt at a Solution



I was positive that the velocity of any projectile at the highest point would be zero, but this was not right in this problem. I think the problem has something to do with mechanical energy but I am not sure. Any suggestions for A? so that I can maybe find B.
You're almost correct: the vertical component of the velocity will be zero at the highest point, but the horizontal component needn't be.
 
12boone said:

Homework Statement


A 0.20KG ball is thrown with a speed of 13 m/s at an angle of 32 degrees.

What is the speed at the highest point?

How high does it go? (Use conservation of energy, and ignores air resistance

The Attempt at a Solution



I was positive that the velocity of any projectile at the highest point would be zero, but this was not right in this problem. I think the problem has something to do with mechanical energy but I am not sure. Any suggestions for A? so that I can maybe find B.

In projectile motion at the highest point one of the components speed will be zero, but remember one of components will have constant value. Projectile motion is a mix of free fall and constant velocity movements.
 

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Similar threads

A ball is thrown w/initial speed vi at an angle 𝜃i with the horizontal
Replies
5
Views
1K
Find the Height of a Building by dropping a ball from the top
Replies
7
Views
3K
Solving a Ball Thrown off a Cliff: How Long Does it Take?
Replies
4
Views
2K
Ball on a string thrown around a spool
Replies
3
Views
879
Calculating Passing Height of Two Thrown Balls
Replies
1
Views
1K
Comparing the Speeds of Thrown Balls at Ground Level
Replies
7
Views
2K
Potential energy of ball thrown upwards
Replies
5
Views
14K
Speed of charged balls after collision
Replies
13
Views
1K
What time are two thrown balls at the same height?
Replies
4
Views
6K
Projectile motion: Two Balls and Building
Replies
9
Views
2K

Hot Threads

Recent Insights

Back
Top