Question

a body of mass 10kg is moving with the kinetic energy of 2000j the momentum of body is​

Answer 1

Explanation:

Answer: The initial kinetic energy is 2000 J and the final kinetic energy is 1000 J. If the mass of the body is doubled and it's velocity is halved. Hence, The initial kinetic energy is 2000 J and the final kinetic energy is 1000 J.

Answer 2

Answer:

Given , Mass of object, m=10 kg

Velocity of object, v=20ms −1

Initial Kinetic energy, K1

=2000 J

Now, Final mass, m

2 =20 kg

Final Velocity, v2 =10m/s

Final Kinetic energy, K2

2 ×20×10 =1000 J

Required Ratio = K2:K1

1000/2000

=2:1