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Question

A body of mass 5 kg is thrown vertically upwards from ground with a velocity of 20 ms−1. What will be its momentum just before hitting the ground? Assume upward direction as positive.


A
100 kgms1
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B
0 kgms1
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C
100 kgms1
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D
20 kgms1
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Solution

The correct option is A 100 kgms1
Given:
Mass of the body, m=5 kg and upwards velocity, u=20 ms1.
We know that v2=u22as
Here, displacement of the body, s=0, acceleration, g=9.8 ms2
Velocity of the body just before hitting the ground, v=2022×(9.8)×(0)
v=202
Since upward direction is taken as positive, v=20 ms1
We know, momentum, p=mv=5×(20)=100 kgms1.

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