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A tennis ball has a mass of about 60 g. Suppose you drop the tennis ball...

A tennis ball has a mass of about 60 g. Suppose you drop the tennis ball off the top of a tall building, and it falls 50 m. How much work (in J) does the force of gravity do on the tennis ball?

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Answer #1

Answer : 294 Joules

<<<<<<<<<<<<<<<<< Explanation >>>>>>>>>>>>>>>>>

final velocity due to gravity( intial velocity =0)

v2 = 2gh

==> v2 = 2*9.8*50

==> v ~= 99

So as the ball falls, its kinetic energy increases.

so total work = final KE - intial KE =1/2m(Vf2-Vi2) = 1/2*60/1000*(99*99-0)=294 j

<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>

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