Monday

April 21, 2014

April 21, 2014

Posted by **Anonymous** on Saturday, September 19, 2009 at 9:10pm.

a)How long was the parachutist in the air?

b)At what height did the parachutist jump from his plane?

- physics - HELP -
**MathMate**, Saturday, September 19, 2009 at 9:38pmThere are two parts to the motion:

1. free fall over a distance of 51.8 m.

initial velocity, u=0 m/s

final velocity, v to be determined.

We ignore air resistance for this part.

acceleration due to gravity, a = -g = -9.8 m/s/s

Using the formula

v²-u² = 2aS

v can be determined.

(see answer to next question if necessary).

Time t1 = (v-u)/a

2. Parachute open (in infinitesimal time).

initial velocity, v (determined from part 1) m/s

final velocity,w = 3.04 m/s

acceleration, a = -1.86 m/s/s

Time, t2 = (w-v)/a

The distance descended when parachute is open can be determined also by:

w²-v² = 2aS

Total time = t1+t2

Add up distance for parts 1 and 2 will give the total distance.

**Related Questions**

physics - A parachustist jumps from an airplane and freely falls y=51.8 m before...

math - When a skydiver jumps from an airplane, the distance d in feet the diver ...

physics - A 55.0-kg skydiver free falls for a period of time before opening his ...

physics - A 55.0-kg skydiver free falls for a period of time before opening his ...

science - A parachutist bails out and freely falls 50m. Then the parachute opens...

physics - An 82.0 kg skydiver jumps out of a balloon at an altitude of 1 500 m ...

physics - A rock dropped from an airplane falls for 13.6 seconds before hitting ...

Physics - 1. A rescue plane flying horizontally at an altitude of 500 m and ...

physics - An 82.0 kg skydiver jumps out of a balloon at an altitude of 1 500 m ...

physics - An 82.0 kg skydiver jumps out of a balloon at an altitude of 1 500 m ...