Question

Calculate the force on a body whose mass is 10 kg  accelerating at the rate of 20 m/s2 .​

Answer 1

Given , Mass of object  ,m=10 kg

Velocity of object , v=20ms −1

Initial Kinetic energy , K

1 = 21×10×20 2 =2000 J

Now Final mass  ,m

2​ =20 kg

Final Velocity , v 2

=10m/s

Required Ratio= K 2

K 1 ​ = 1000/2000

=2