Ahelicopter lifts a 60 kg astronaut 17 m vertically from the ocean by means of a cable. the acceleration of the astronaut is g/10. (a) how much work is done on the astronaut by the force from the helicopter? j (b) how much work is done on the astronaut by her weight? j (c) what is the kinetic energy? j (d) what is the speed of the astronaut just before she reaches the helicopter?

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?