(a) Estimate the force with which a karate master strikes a board if the hand’s speed at time of impact is 10.0 m/s, decreasing to 1.00 m/s during a 0.002 00-s time-of-contact with the board. The mass of his hand and arm is 1.00 kg.
(b) Estimate the shear stress if this force is exerted on a 1.00-cm-thick pine board that is 10.0 cm wide.
(c) If the maximum shear stress a pine board can support before breaking is 3.60 - 106 N/m2, will the board break?