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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