Question

A body of mass 4 kg is lifted to a height of 5 meters. What is the potential energy gained by the body? (Take \( g = 9.8 \, \text{m/s}^2 \))

• A. 20 J
• B. 49 J
• C. 98 J
• D. 196 J

Hint:

Gravitational potential energy is directly proportional to mass and height: \( PE = mgh \). Always use standard \( g = 9.8 \, \text{m/s}^2 \) unless mentioned otherwise.

Answer 1

The Correct Option is D

Potential energy is calculated using the formula: \[ PE = mgh \] Where: \( m = 4 \, \text{kg} \), \( g = 9.8 \, \text{m/s}^2 \), \( h = 5 \, \text{m} \) \[ PE = 4 \times 9.8 \times 5 = 196 \, \text{J} \] Hence, the body gains a potential energy of 196 joules.