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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?
(c) What is the kinetic energy?
(d) What is the speed of the astronaut just before she reaches thehelicopter?
m/s
Suppose a 20 kg ball moving at 5 m/s collides with a 100 kg ball moving at 3 m/s. How much kinetic energy was lost in the collision
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