Question

Calculate change in Kinetic energy of a moving body if it's velocity is reduced to 1/3 of the initial velocity.
1) Reduces to 1/9th 2) Reduces to 1/6th 3) Increases by 1/4th 4) No change

Answer 1

Answer:This may help you

Explanation:

K.E=0.5×m×v²

K.E(new)=0.5×m×(v/3)²

K.E(new)=0.5×m×v²/9

K.E−K.E(new)=(1−1/9)0.5×m×v²

=(8/9)0.5×m×v²

Hence,this is the decrease in Kinetic energy.