ap physics
posted by Appreciative student .
hi i am not sure how to do this...thank you
a man is going to pitch a ball. he moves the ball in a circular path of radius 0.6 m, constantly applying a force of 30N to the ball in the same direction as the ball's velocity along the circular path. at the highest point on the path(point A), the velocity of the ball is 15 m\s. what will the speed of the ball be when the man lets go of the ball at the lowest point along the circular path(point B)?
I know that only forces thta are parallel to the motion of an object do work on the object, so in this problem, the man's force of 30N always does work on the ball I think this problem has something to do with finding the potential and kinetic energy of the ball at point A and then adding these values (KE + PE) and setting this value for the total energy equal to the KE kinetic energy at point B (since the potenial energy will = 0 at point B)

ap physics 
Appreciative student
CONTINUED:
*i forgot to mention that the ball has a mass 5kg
Basically I'm confused as to how to calculate the potential energy of the ball at point A;
I know that PE = mgh
so PE = (5kg) (9.8 m\s^2) (h) but would h equal the diameter of the circular path? but this doesnt seem right to me.....
Respond to this Question
Similar Questions

physics
A 9.0 x 10^3 kg ball is attached to a 3.6 x 10^2 mass (M) by string that passes through a hole in a horizontal frictionless surface. The ball travels in a circular path of radius 0.35 m. What is the speed of the ball? 
Physics
A solid brass ball of mass 9.5 g will roll smoothly along a looptheloop track when released from rest along the straight section. The circular loop has radius R = 4.2 m, and the ball has radius r << R. (a) What is h if the … 
physics
A ball of mass moves in a horizontal circular path of radius a with speed v as shown in the illustration below. Find the tension in the cord. 
physics
6) The goalkeeper catches the ball flying by speed 30 m / s and stopped its movement in a period of 0.15 seconds . What force did he act on the ball, if we consider the stopping of the ball for constantly slow motion? 
physics
The drawing shows a steel ball rolling along a flat surface at constant velocity from point A to point B. A magnet exerts an attractive force on the ball only for the short time that passes as the ball rolls past point B. Which one … 
physics
he drawing shows a steel ball rolling along a flat surface at constant velocity from point A to point B. A magnet exerts an attractive force on the ball only for the short time that passes as the ball rolls past point B. Which one … 
Physics
A tennis ball connected to a string is spun around in a vertical, circular path at a uniform speed. The ball has a mass m = 0.162 kg and moves at v = 4.73 m/s. The circular path has a radius of R = 0.87 m 1)What is the magnitude of … 
Physics
A tennis ball connected to a string is spun around in a vertical, circular path at a uniform speed. The ball has a mass m = 0.162 kg and moves at v = 4.73 m/s. The circular path has a radius of R = 0.87 m 1)What is the magnitude of … 
physics
Ball A with a mass of 0.500 kg is moving east at a velocity of 0.800 m/s. It strikes ball B, also of mass 0.500 kg, which is stationary. Ball A glances off B at an angle of 40.0° north of its original path. Ball B is pushed along … 
Physics
A pitcher hurls a 0.25kg ball around a vertical circular path of radius 0.6 m, applying a tangential force of 30N, before releasing it at the bottom of the circle (underhand pitch). If the speed of the ball at the top of the circle …