A particle of mass 0.2 kg starts from rest and moves in one dimension under a force delivering constant power 0.5 W. Find its speed after 5 s.
Physics · Work , Power and Energy · Power
JEE Advanced 2013

Question

A particle of mass 0.2 kg starts from rest and moves in one dimension under a force delivering constant power 0.5 W. Find its speed after 5 s.

G1 Physics · Accepted Answer

Constant power gives ΔK=Pt=0.5×5=2.5 J. Starting from rest, ½(0.2)v²=2.5, so v²=25 and v=5 m/s.