Question

In an adventure movie, a 68 kg stunt woman slips off a ledge, falls 7.5 m and lands in a huge air bag. Her vertical speed when initially leaving the ledge was zero. Her speed just before she hit the air bag was 10 m/s.

a) What is the woman’s change in kinetic energy after she comes into contact with the bag? (3400 J or -3400 J)

b) What is the total work done on the stunt woman while she is in the air? (5003 J or 3400J)

c) How much work is done by gravity on the stunt woman while she is in the air? (5003 J or 510 J)

d) How much work is done by air resistance on the stunt woman while she is in the air? ( 453 J or -1603 J)

e) What is the magnitude of the average force of air resistance over the whole fall? (214 N or 453 N)

f) How fast would the woman be traveling when she hit the air bag if air resistance was negligible?

Answer 1