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Physics · LAWS OF MOTION
हिन्दीA train is moving along a straight horizontal track with an acceleration of \( 2 \text{ m s}^{-2} \). At the moment when its velocity is \( 10 \text{ m s}^{-1} \), a stone of mass \( 0.5 \text{ kg} \) is dropped from a window. Taking \( g = 10 \text{ m s}^{-2} \), the net force acting on the stone immediately after release is:
Correct answer · Option 1
\( 5 \text{ N} \) vertically downwards
Explanation
The instant the stone is dropped, no horizontal force acts on it (air resistance neglected). The only force acting on it is gravity: \( F = mg = 0.5 \times 10 = 5 \text{ N} \) vertically downwards.
