From the moment the ball of mass m=16g was launched till it reached its highest

Question

From the moment the ball of mass m=16g was launched till it reached its highest point for the first time, what is the absolute value of work done by gravity on the ball? Use g-9.8 m/s2 76.8 mJ Using the value of the work done by the gravity calculate the initial velocity of the ball in y-direction 3.1 m/s How does this value of initial velocity in y-direction compare with the value you obtained directly from your video analysis? Describe and explain any differences. This answer has not been graded yet During the same part of the motion of the ball, what is the average power expended by the gravity? 508.1

Explanation / Answer

power = energy used / time

time to reach the max height =3.1/9.8 = 0.316 seconds apprx

power= 76.8 x 10^-3 / 0.316 = 243 mW

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