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Question

A disc of mass 1.0kg kept floating horizontally in air by firing bullets of mass 0.05kg each vertically at it, at the rate of 10 per second. If the bullets rebound with the same speed, the speed with which these are fired will be-
1026348_fdea576386224260a675552f94a9c642.png

A
0.098m/s
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B
0.98m/s
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C
9.8m/s
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D
98.0m/s
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Solution

The correct option is C 9.8m/s
2mnv=Mg
v=Mg2mn

=10×9802×5×10cm/s

=9800100cm/s

=98cm/s
=9.8m/s

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