A helicopter lifts a 81 kgastronaut 20 m vertically from theocean by means of a cable. The acceleration of the astronaut isg/10.
(a) How much work is done on the astronaut by the forcefrom 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 thehelicopter?
m/s