A batter hits a baseball with mass 0.146kg straight upward with an initial speed

Question

A batter hits a baseball with mass 0.146kg straight upward with an initial speed of 26.0 m/s. (a) How much work has gravity done on thebaseball when it reaches a height of 15.5m above the bat?
1 J

(b) Use the work—energy theorem to calculate the speed of thebaseball at a height of 15.5 m above the bat. You can ignore airresistance.
2 m/s
(a) How much work has gravity done on thebaseball when it reaches a height of 15.5m above the bat?
1 J

(b) Use the work—energy theorem to calculate the speed of thebaseball at a height of 15.5 m above the bat. You can ignore airresistance.
2 m/s

Explanation / Answer

a) The work done by the gravity is              W = mgh                  = (0.146 kg)(9.80 m/s2)(15.5m) b) From the work eneregy theorem ,we have            W = (1/2)mv^2 -(1/2)mu^2 Here u = 26.0 m/s Substitute the values for v.

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