STANDARD Physics Force and Acceleration MCQ Question
A constant force acting on a body of mass of 5 kg change its speed from 5 m s⁻¹ to 10 m s⁻¹ in 10 s without changing the direction of motion. The force acting on the body is
1.5 N
2 N
2.5 N
5 N
Correct Answer
Detailed Explanation
Here, m = 5 kg, u = 5 m s⁻¹, v = 10 m s⁻¹, t = 10 s. Using v = u + at, a = (v - u) / t = (10 - 5) m s⁻¹ / 10 s = 0.5 m s⁻². As F = ma, F = 5 kg × 0.5 m s⁻² = 2.5 N.
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