Q7 - This problem has two parts. I will state the questions for each of those two parts, as well as any other additional info below in "Description".

Question

A tennis ball of mass m = 0.076 kg is thrown straight up with an initial speed v₀ = 12 m/s. Let the gravitational potential energy be zero at the initial height of the tennis ball.

Part a) What is the maximum height, h in meters, the ball reaches?

Part b) What is the work done by gravity, W_g in Joules, during the ball's flight to its maximum height?

Answer 1

a) Using the kinematic equation h=v²/2g = 7.34 meters

b) Work = mgh = .076*9.81*7.34 = 5.47 J