# If an object with a mass of 5 kg  changes speed from 5m/s to 13 m/s, by how much does its kinetic energy change?

May 17, 2018

$\text{360 J}$

#### Explanation:

Kinetic energy is given by the formula

${\text{K" = 1/2\ "mv}}^{2}$

Change in kinetic energy when there is change in velocity is

$\text{ΔK" = 1/2\ "m(v"^2 - "u"^2")}$

$\text{ΔK" = 1/2 × "5 kg" × [("13 m/s")^2 - ("5 m/s")^2] = "360 J}$