Question

Due to some frictional forces ,velocity of a body reduces from 10 to 6 meter per second what will be %age loss in kinetic energy

Answer 1

Answer:

V1 = 10 m/s

KE1 = mv²/2

= m*10²/2

= m*100/2

=m*50 J

V2 = 6 m/s

KE2 = mv²/

= m*6²/2

= m*36/2

= m*18 J

Loss of energy = KE1 - KE2

= 50 - 18

= 32 J

Loss percentage = 32*100%/50 = 32*2% = 64%

The energy is decreased by 64%.