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Question

A body of mass 10 kg is moving with velocity 4 ms1. The kinetic energy and momentum of the body is:


A

200 J and 160 kg ms1

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B

400 J and 40 kg ms1

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C

80 J and 40 kgms1

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D

80 J and 160 kgms1

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Solution

The correct option is C

80 J and 40 kgms1


Given, mass of the body m=10 kg and velocity v=4 ms1
Kinetic energy (K.E.) = 12mv2
K.E. = 12×10× 42 = 80 J
Momentum (P) = mv
P = 10 × 4 = 40 kgms1
Kinetic energy = 80 J and momentum = 40 kgms1


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