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))`

`1.2` kg

`0.5`kg

20 kg

3 kg

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