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Q.

A bullet of mass 10gm is fired horizontally with a velocity 1000ms-1 from a riffle situated at a height 50 m above the ground. If the bullet reaches the ground with a velocity 500ms-1, the work done against air resistance in the trajectory of the bullet is (in joule) ( g=10ms-1)

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a

5005

b

3755

c

3750

d

17.5

answer is B.

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Detailed Solution

By work energy theoremW=mgh+12mu2-12mv2

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A bullet of mass 10gm is fired horizontally with a velocity 1000ms-1 from a riffle situated at a height 50 m above the ground. If the bullet reaches the ground with a velocity 500ms-1, the work done against air resistance in the trajectory of the bullet is (in joule) ( g=10ms-1)