Question

A body of mass 10 kg is moving with a velocity of 20 m/s. What is the kinetic energy of the body?

• A. \( 2000 \, \text{J} \)
• B. \( 1000 \, \text{J} \)
• C. \( 4000 \, \text{J} \)
• D. \( 5000 \, \text{J} \)

Hint:

Remember: Kinetic energy is calculated using the formula \( KE = \frac{1}{2} m v^2 \).

Answer 1

The Correct Option is C

Step 1: Apply the kinetic energy formula
Kinetic energy \( KE \) is calculated as:\[KE = \frac{1}{2} m v^2\]where:- \( m \) represents the object's mass,- \( v \) represents the object's velocity.
Step 2: Input provided data
Data provided:- Mass \( m = 10 \, \text{kg} \),- Velocity \( v = 20 \, \text{m/s} \).
Insert these values into the formula:\[KE = \frac{1}{2} \times 10 \times (20)^2 = \frac{1}{2} \times 10 \times 400 = 2000 \, \text{J}\]Answer: The object's kinetic energy is \( 2000 \, \text{J} \). Option (1) is the correct answer.