A ball is thrown straight up. It passes a 2.45 m high window 7.65 m off the ground on its path up and takes 1.40 s to go past the window. What was the ball's initial velocity (in m/s)?

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?

A17,250 kg rocket is pushed with a thrust of 6,450,284 n. what is the acceleration of the rocket?

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.