Question
A 83 kg person escapes from a burning building by jumping from a window 21 m above a
catching net.
The acceleration of gravity is 9.81 m/s
2
.
Assuming that air resistance is simply a
constant 92 N force on the person during the
fall, determine the person’s velocity just before hitting the net.
Answer in units of m/s
catching net.
The acceleration of gravity is 9.81 m/s
2
.
Assuming that air resistance is simply a
constant 92 N force on the person during the
fall, determine the person’s velocity just before hitting the net.
Answer in units of m/s
Answers
drwls
Kinetic energy at net = (potential energy loss) - (work done against friction)
(1/2)M V^2 = M g H - 92*21
H = 21 m
M = 83 kg
g = 9.81 m/s^2
Solve for V.
(1/2)M V^2 = M g H - 92*21
H = 21 m
M = 83 kg
g = 9.81 m/s^2
Solve for V.
Je
27.8m/s2