STANDARD Physics Work-Energy Theorem MCQ Question
A body of mass 4 kg is moving with momentum of 8 kg m s⁻¹. A force of 0.2 N acts on it in the direction of motion of the body for 10 s. The increase in kinetic energy is
10 J
8.5 J
4.5 J
4 J
Correct Answer
Detailed Explanation
The initial velocity is calculated using p = mu, giving u = 2 m/s. The acceleration is a = F/m = 0.05 m/s². The distance traveled in 10 s is 22.5 m. Work done, W = Fd = 4.5 J. According to the work-energy theorem, the increase in kinetic energy equals the work done.
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