If there were no air resistance, how long would it take a free-falling parachutist to fall from a plane at 3200 meters to an altitude of 350 meters, where she will pull her ripcord? What would her speed be at 350 m? (in reality the air resistance will restrict her speed to perhaps 150 km/hr.)
2006-09-24 07:19:00 · 3 answers · asked by micheal j 1 in Science & Mathematics ➔ Physics
s = 1/2 gt^2 + vo t + so
where g = -9.8 m/s^2; vo = 0; so = 3200
and s = 350
350 = 1/2 (-9.8) t^2 + 3200
4.9 t^2 = 2850
t = 24.1 sec
v = gt + vo, where vo = 0
v = -9.8 * 24.1 = -236.3 m/s
2006-09-24 07:31:53 · answer #1 · answered by bpiguy 7 · 1⤊ 0⤋
3200-350 = 2850
distance = 2850
v^2 = vo^2 +2ad
vo = 0
a = 9.81
d = 2850
v = -236.5m/s <- finaly velocity at 350m
d = x0t + .5at^2
d = -2850
x0 = 0
a = -9.81
t = 24.1s
2006-09-24 14:33:02 · answer #2 · answered by Brad 4 · 0⤊ 0⤋
No offense, but if you're in AP Physics, you should do these by yourself. Who's gonna help you on the AP test? Actually, the AP test was pretty easy, but still, you need to learn how to do these problems.
2006-09-24 14:39:37 · answer #3 · answered by عبد الله (ドラゴン) 5 · 0⤊ 0⤋