OnlineCBT
Physics · LAWS OF MOTION
हिन्दीA block of mass \( 4\text{ kg} \) is kept on the floor of an elevator which is accelerating upwards with a constant acceleration of \( 2.5\text{ m/s}^2 \). Taking \( g = 10\text{ m/s}^2 \), the normal reaction force exerted by the elevator floor on the block is:
Correct answer · Option 4
50 N
Explanation
Equation of motion: \( N - mg = ma \implies N = m(g + a) = 4 \times (10 + 2.5) = 50\text{ N} \).
