A Karate Master Strikes a Board with an Initial Velocity

question 39

Multiple Choice

A karate master strikes a board with an initial velocity of 10.0 m/s,decreasing to 1.0 m/s as his hand passes through the board.If the time of contact with the board is 0.002 0 s,and the mass of the coordinated hand and arm is 1.0 kg,what is the force exerted on the board?

• A)1 000 N
• B)1 800 N
• C)2 700 N
• D)4 500 N

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