If an object with a mass of #5 kg # changes speed from #3m/s# to # 14m/s#, by how much does its kinetic energy change?

1 Answer
Apr 28, 2018

Answer:

THe change in kinetic energy is #=467.5J#

Explanation:

The kinetic energy is

#KE=1/2mv^2#

The change in kinetic energy is

#DeltaKE=1/2mv_2^2-1/2mv_1^2=1/2m(v_2^2-v_1^2)#

The mass is #m=5kg#

The initial velocity is #v_1=3ms^-1#

The final velocity is #v_2=14ms^-1#

Therefore,

#Delta KE=1/2xx5xx(14^2-3^2)=467.5J#