An object has a mass of #4 kg#. The object's kinetic energy uniformly changes from #24 KJ# to # 42KJ# over #t in [0, 9 s]#. What is the average speed of the object?
Let the rate of increase of kinetic energy with time be some
We have two conditions:-
from 1. & 2.
Average speed =
Let rate of change of kinetic energy be
Integrating both sides with
We have expression for kinetic energy as
Equation (1) becomes