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Q.

A ball of mass ‘m’ is thrown in air with speed v1 from a height h1 and it is caught at a height h2>h1 when its speed becomes v2 . Find the work done on the ball by air resistance.

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a

mgh2-h1+12mv22-v12

b

mgh2-h1

c

12mv22-v12

d

mgh2-h1-12mv22-v12

answer is A.

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Wmg+Wair=∆K.E.
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