Question

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?

Answer 1

`"360 J"`

Explanation:

Kinetic energy is given by the formula

`"K" = 1/2\ "mv"^2`

Change in kinetic energy when there is change in velocity is

`"ΔK" = 1/2\ "m(v"^2 - "u"^2")"`

`"ΔK" = 1/2 × "5 kg" × [("13 m/s")^2 - ("5 m/s")^2] = "360 J"`