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The 'e' Equation

A solid disc ...

Question

A solid disc of mass M is just held in air horizontal 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 0.05 kg. What is the mass of the disc? (g=10 ms^_2)

A

$1.2$ kg

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B

$0.5$ kg

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C

$20$ kg

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D

$3$ kg

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Solution

The correct option is A
$1.2$ kg

Weight of the disc will be balanced by the force applied by the bullet on the disc in vertically upward direction

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Similar questions

A solid disc of mass $M$ is just held in air horizontal by throwing $40$ stones per sec vertically upwards to strike the disc each with a velocity $6$ $m s^{- 1}$ . If the mass of each stone is $0.05$ kg. What is the mass of the disc?
$(g = 10 m s^{- 2})$

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