Problem number 1 (10 pts) a parachutist jumps at an altitude of 3000 meters. if the parachute does not open, she is expected to approach a terminal speed of 30 m/sec. (g 10 m/s) (a) [4 points] assuming that air resistance is proportional to speed, about how long does it take her to reach 90% of the terminal speed? (b) [2 points] how far has she traveled in reaching 90% of the terminal speed? after her parachute opens, her speed is slowed to 3m/sec. as she hits the ground, she her knees to absorb the shock. flexes (c) [4 points] how far must she bend her knees in order to experience deceleration no greater than 10 g? assume that her knees are like a spring with a resisting force proportional to displacement (mechanical energy is conserved).