Question

Which of the following bodies have more kinetic energy- Body A having mass 1.5 kg
moving with speed 30 ms or a body B having mass 2 kg moving with speed 20 msl?
Justify your answer.​

Answer 1

Step-by-step explanation:

We know that, the kinetic energy is

K.E=

2

1

mv

2

....(I)

Checking all options given -

A) m=3M & v=v

K.E=

2

1

mv

2

K.E=

2

1

×3M×v

2

K.E=

2

3Mv

2

B) m=3M & v=2v

K.E=

2

1

mv

2

K.E=

2

1

×3M×4v

2

K.E=6Mv

2

C) m=2M & v=3v

K.E=

2

1

mv

2

K.E=

2

1

×2M×9v

2

K.E=9Mv

2

D) m=M & v=4v

K.E=

2

1

×M×16v

2

K.E=8Mv

2