1. Assume that air resistance is proportional to speed. A parachutist falls from rest. If he did not open his parachute, he would reach a terminal velocity of 90 m/s. With an open parachute, he reaches a terminal velocity of 10 m/s. He opens his parachute 20 s after he started falling. Calculate (a) The distance already fallen at the moment when he opens his parachute; (b) The total distance fallen 40 s after he started falling.
1. Assume that air resistance is proportional to speed. A parachutist falls from rest. If he did not open his parachute, he would reach a terminal velocity of 90 m/s. With an open parachute, he reaches a terminal velocity of 10 m/s. He opens his parachute 20 s after he started falling. Calculate (a) The distance already fallen at the moment when he opens his parachute; (b) The total distance fallen 40 s after he started falling.
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Transcribed Image Text:1. Assume that air resistance is proportional to speed. A parachutist falls from rest. If he did not open his
parachute, he would reach a terminal velocity of 90 m/s. With an open parachute, he reaches a terminal
velocity of 10 m/s. He opens his parachute 20 s after he started falling. Calculate (a) The distance already
fallen at the moment when he opens his parachute; (b) The total distance fallen 40 s after he started falling.
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