# AP physics c

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A helicopter lifts a 63 kg astronaut 10 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?

• AP physics c -

a. Work = F * d = m*g/10 * d
Work = 63*(9.8/10) * 10 = 617.4 Joules.

b. Work=m*g * d = 63*9.8 * 10 = 6174 J.

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