Question

Give Reason
A boy and a man running with the same speed have different kinetic energies
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Answer 1

Therefore Kinetic energy depends on mass as well as speed. Hence a man and a boy running at same speed have different kinetic energy because although their speed is same their mass is different. The kinetic energy of moving body is equal to be the product of the mass(m) of the body and square of its speed(v2).

Explanation:

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Answer 2

Answer :

Due to different masses.

Explanation :

A boy and a man running with the same speed have different kinetic energies, because the boy and the man has different masses and we know that kinetic energy is directly proportional to mass. So kinetic energy is different.

More Information

The energy possessed by a body by virtue of its motion is called Kinetic energy.

Kinetic energy depends on :

1. Mass of the body
2. Speed of the body

Kinetic energy = 1/2 mv²

here, m is mass and v is speed.