Ametal ball is thrown at a horizontal rod of length 5 m, radius 1 cm and sheer modulus of 5×109 n/m2 . if the ball was moving at 30 m/s when it struck the rod and took 0.5 seconds to reach a maximum bend of 2 cm, what is the mass of the ball?

Boxing gloves are padded to lessen the force of a blow. (a) calculate the force exerted by a boxing glove on an opponent’s face, if the glove and face compress 7.50 cm during a blow in which the 7.00-kg arm and glove are brought to rest from an initial speed of 10.0 m/s. (b) calculate the force exerted by an identical blow in the gory old days when no gloves were used and the knuckles and face would compress only 2.00 cm. (c) discuss the magnitude of the force with glove on. does it seem high enough to cause damage even though it is lower than the force with no glove?