Question

A body of mass 5 kg is moving with a velocity of 10 m/s. What is its kinetic energy?

• A. 100 J
• B. 150 J
• C. 200 J
• D. 250 J

Hint:

Always square the velocity first and use proper units (kg for mass, m/s for velocity) in the KE formula.

Answer 1

The Correct Option is D

To find the kinetic energy of a body, we use the formula:

Kinetic Energy (KE) = 0.5 × mass × velocity²

Given:

• Mass (m) = 5 kg
• Velocity (v) = 10 m/s

Plug these values into the kinetic energy formula:

KE = 0.5 × 5 kg × (10 m/s)²

First, calculate the square of the velocity:

(10 m/s)² = 100 m²/s²

Then, substitute back into the formula:

KE = 0.5 × 5 kg × 100 m²/s² = 250 kg·m²/s²

The kinetic energy is 250 J (joules).