Question

the speed of a vehicle of mass 500 kg increases from 36 km per hour to 72 km per hour calculate the increase in its kinetic energy

Answer 1

ke1 is 9000 by 1/2mv^2
and ke2 is 18000 then∆ke will be ke2 -ke 1
i.e. 9000

Answer 2

1÷2× mv×v is the formula of kinetic energy where vis 72-36=36 . mass is 500kg