A body of mass $5$ kg is thrown vertically up from the ground with velocity $20$ $m / s$ . What will be its momentum just before hitting the ground? Take upward direction as positive.

100 Kg m/s

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0 Kg m/s

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-100 Kg m/s

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-20 Kg m/s

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Solution

The correct option is C -100 Kg m/s
The velocity of the ball just before hitting the ground will be equal to the initial velocity of the ball but in downwards direction.
So, Momentum $P = m v$
$\Rightarrow P = 5 x (- 20) = - 100$ $K g . m / s$ (negative sign indicates that the direction of velocity is downwards)

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A body of mass 5 kg is thrown vertically up from the ground with velocity 20 m/s. What will be its momentum just before hitting the ground? Take upward direction as positive.

The correct option is C -100 Kg m/sThe velocity of the ball just before hitting the ground will be equal to the initial velocity of the ball but in downwards direction. So, Momentum P=mv ⇒P=5x(−20)=−100 Kg.m/s (negative sign indicates that the direction of velocity is downwards)

A body of mass $5$ kg is thrown vertically up from the ground with velocity $20$ $m / s$ . What will be its momentum just before hitting the ground? Take upward direction as positive.