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Conservation of Momentum

A car of mass...

Question

A car of mass $800$ kg is moving with a constant velocity $40$ km/h. Find the net force acting on it.

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Solution

The car is moving with a constant speed.
Thus, there is no acceleration.
so, the only force working on the car is the Normal Force, N =>
N = F = mg
F = 800 × 9.8
F = 7840 Newton.

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