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A solid disc of mass M is just held in a...

A solid disc of mass M is just held in air horizontally by throwing 40 stones per sec vertically upwards to strike the disc each with a velocity 6 `ms^(-1)`. If the mass of each stone is `0.05kg` what is the mass of the disc `(g=10ms^(-2))`

A

1.2 kg

B

0.5 kg

C

20kg

D

3kg

Text Solution

Verified by Experts

The correct Answer is:
A
Weight of the disc = force applied by bullet
`rArr Mg = nmv rArr m = (40 xx 0.05 xx 6)/(10)`
` = 1.25 kg `
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