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Q.

A disc of mass 2.5kg  is kept floating horizontally in mid air by firing 5 bullets per second vertically up. If the mass of each bullet is 10gram  and bullets rebound with same speed, the speed of each bullet is, (g=10ms−2)

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a

100ms−1

b

250ms−1

c

50ms−1

d

10ms−1

answer is B.

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Detailed Solution

Mg=2mnu u=Mg2mn=2.5×102×10×10−3×5=250m/s
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