If an object with a mass of 12 kg changes speed from 3 m/s to 1m/s, by how much does its kinetic energy change?

1 Answer

decrease by 48\ J

Explanation:

Change in kinetic energy of an object of mass m=12 kg due to change in speed from v_1=3m/s to v_2=1m/s

=1/2mv_2^2-1/2mv_1^2

=1/2(12)3^2-1/2(12)1^2

=-48\ J

The above negative value shows that the kinetic energy of object decrease by 48\ J