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Question

A stone of mass 1 kg is lying on the floor of a train which is accelerating with 1ms2. The net force acting on the stone is

A
Zero
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B
1 N
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C
5 N
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D
10 N
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Solution

The correct option is B 1 N
Here, mass of the stone, m=1 kg
As the stone is lying on the floor of the train, its acceleration is same as that of train.
Force acting on the stone,F=ma=(1kg)(1ms2)=1N
Note: weight of the stone is balanced by the normal reaction of the floor.

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