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  4. If a stone of mass 0.05 kg is thrown out a window of a train moving at a constant speed of 100 km/h then magnitude of the net force acting on the stone is

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Q. If a stone of mass $0.05 \,kg$ is thrown out a window of a train moving at a constant speed of $100\, km/h$ then magnitude of the net force acting on the stone is

BITSATBITSAT 2018

Solution:

After the stone is thrown out of the moving train, the only force acting on it is the force of gravity i.e. its weight.
$\therefore F=m g=0.05 \times 10=0.5 \,N$.