A van is standing on a frictionless portion of a horizontal road. To start the engine, the vehicle must be set in motion in the forward direction. How can be persons sitting inside the van do it without coming out and pushing from behind?
Answers
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If people are backing up at the same time, the van will move forward to keep the centre of mass in the same position and the van will start.
Explanation:
People in the van can move the van forward to start the engine without getting out if they are reversing simultaneously. In the absence of an external force such as a road friction force, the centre of mass of the van and the people will remain stationary together. So if people are backing up at the same time, the van will move forward to keep the centre of mass in the same position and the van will start.