Question

A body of mass 10kg is moving with a velocity of 20m/s. If the mass of the body is doubled and its velocity is halfed, find: 1. the initial kinetic energy, and 2. the final kinetic energy.​

Answer 1

Explanation:

Given , Mass of object ,m=10 kg

Velocity of object , v=20ms

−1

Initial Kinetic energy , K

1

=

2

1

×10×20

2

=2000 J

Now Final mass ,m

2

=20 kg

Final Velocity , v

2

=10m/s

Final Kinetic energy , K

2

=

2

1

×20×10

2

=1000 J

Required Ratio=

K

2

K

1

=

1000

2000

=2

Answer 2

Answer:

1.2000 J

2.1000 J

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