Question: For the karate chop in Fig 6 27 assume that the

For the karate chop in Fig. 6.27, assume that the hand has a mass of 0.35 kg and that the speeds of the hand just before and just after hitting the board are and 0, respectively. What is the average force exerted by the fist on the board if
(a) The fist follows through, so the contact time is 3.0 ms, and
(b) The fist stops abruptly, so the con-tact time is only 0.30 ms?

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