RRB Group D Model Paper 5 with solutions

Question : 31 of 100

Marks: +1, -0

When the velocity of a body is doubled_______.

its momentum is doubled.
its acceleration is doubled.
its kinetic energy is doubled.
its potential energy is doubled.

Solution:

(1) Kinetic energy =

1/2

× mass × square of velocity; and Momentum = mass × velocity. So, if velocity is doubled, then its momentum also doubles and its kinetic energy becomes four times.

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