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A motor car in rectilinear motion steadily decelerates to rest in 20s.Using Newton's second law of motion,explain why a higher force is required to stop the car in 10s than in 20s.

  • physics -

    Acceleration is velocity change DIVIDED BY time.

    Stopping in less time requires greater acceleration, a.
    F = m a
    So it also requires more force. Twice as much, in this case.

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