What is the average launch speed?

AI Thread Summary
To determine the average launch speed of a basketball launched horizontally from a diving board 4.50 m above water, the vertical motion must be analyzed. The time of flight can be calculated using the equation for vertical motion, y = y1 + v1t - (1/2)gt^2, where g is the acceleration due to gravity. The initial vertical velocity is zero since the launch is horizontal. Once the time of flight is determined, the average speed can be found by dividing the horizontal distance (6.25 m) by the calculated time. Understanding the relationship between vertical motion and horizontal distance is crucial for solving the problem.
Angela_vaal
Messages
59
Reaction score
1

Homework Statement


During several practice runs you stand at the end of a diving board and launch the basketball horizontally from a position 4.50 m above the water. If the average landing spot is6.25 m horizontally from your initial position, what is the average launch speed?

Homework Equations

The Attempt at a Solution


avg speed=total distance/total time. but time is not stated? where do i start ?! i attached the photo of the problem
 

Attachments

  • physics problem.png
    physics problem.png
    4.6 KB · Views: 556
Physics news on Phys.org
Angela_vaal said:
where do i start ?
By thinking about the vertical motion. What do you know about the vertical components of initial and final speeds, time, distance and acceleration? From the items you know, what else can you calculate?
 
haruspex said:
By thinking about the vertical motion. What do you know about the vertical components of initial and final speeds, time, distance and acceleration? From the items you know, what else can you calculate?

would I calculate time using the formula y=y1+v1t-(1/2)gt^2?
 
Angela_vaal said:
would I calculate time using the formula y=y1+v1t-(1/2)gt^2?
What do you think?
 
haruspex said:
What do you think?
I'm thinking I have to calculate time somehow to get the average speed. But if i use this equation, I'm not sure how I will use this equation if I don't have the initial velocity.
 
Angela_vaal said:
I don't have the initial velocity.
You just need the initial vertical component of velocity:
Angela_vaal said:
launch the basketball horizontally
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Two launches ferrying between two landing stations along a river
Replies
23
Views
1K
Two Equations for Average Velocity?
Replies
2
Views
2K
Do I need to consider mass in the equations?
Replies
3
Views
1K
A ball bounces off a brick wall, Find the average acceleration
Replies
5
Views
5K
Average velocity? Average speed?
Replies
9
Views
3K
Average speed question: forwards then backwards
Replies
4
Views
1K
Kinematics: Find average speed from displacement-time graph.
Replies
10
Views
5K
Vectors: Displacement, average velocity & speed
Replies
7
Views
2K
Magnitude of the average force during a collision
Replies
2
Views
7K
Speed at Takeoff and Average Acceleration
Replies
8
Views
3K

Hot Threads

Recent Insights

Back
Top