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Q.

A dish of mass 10 g is kept floating horizontally in the air by firing bullets each of mass 5 g with the same velocity. If 10 bullets are fired per second and the bullets rebound with the same velocity, then the velocity of each bullet is

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a

196 cm/sec

b

98 cm/sec

c

49 cm/sec

d

none of these

answer is B.

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Detailed Solution

n×mu−n×(−mu)=Mg⇒u=Mg2nm=10×9802×10×5cm/s⇒u=98cm/s
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