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
A) $t^{1/2}$
B) $t$
C) $t^{3/2}$
D) $t^{2}$
Explanation
(b) Power delivered to the body
$P = F.v = mav$
Since, body undergoes one dimensional motion and is initially at rest, so
$v = 0 + at$
$\therefore P = ma^{2}t$ or $P \propto t$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.