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4 May, 11:22

How much force is needed to stop a 80 kg football player if he decelerates at 5m/s?

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  1. 4 May, 14:25
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    Use Newton's 2nd law of motion.

    Here it is:

    Force = (mass) x (acceleration)

    = (80 kg) x (-5 m/s²)

    = - 400 Newtons.

    I called the acceleration negative because the player is slowing down.

    The force comes out negative because it's in the direction opposite to

    his motion.
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