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Why is not possible to push a car from ...

Why is not possible to push a car from inside

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While trying to push a car from outside, he pushes the ground backwards at an angle. The ground offers an equal reaction in the opposite direction, so car can be moved. But the person sits inside means car and the person becomes a single system, and the force given will be a internal force. According to Newton.s third law, total internal force acting on the system is zero and it cannot accelerate the system.
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