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  4. A body is initially at rest. It undergoes one- dimensional motion with constant acceleration. The power delivered to it at time ‘t’ is proportional to

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Q. A body is initially at rest. It undergoes one- dimensional motion with constant acceleration. The power delivered to it at time ‘t’ is proportional to

KCETKCET 2020

Solution:

As we know,
$P = Fv$
where, $P$ is the power, $F$ is the force and $v$ is the velocity.
or, $P =$ mav
or, $P = ma ^{2} t$
or, $P \propto t$