(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A parachutist of mass 70kg, in free fall at 136 km/h, opens a parachute. if the chute creates a 895 N air resistance force and the parachutist is being pulled down by a force of gravity at 686 N

a) find hte acceleration of the parachutist

b) how far does she fall in 5.0 s?

2. Relevant equations

Fnet = ma, d = v1t + 1/2at^2

3. The attempt at a solution

First i determined part A and i got the answer 3.0 m/s^2 [up]. which is correct in the answer key.

then i used the equation d = v1t + 1/2at^2, converting 136 km/h to m/s

d = v1t + 1/2at^2

d = 37.7 m/s(5s) + 1/2(3 m/s^2)[(5s)^2]

and i got 226.4 m. the correct answer is 150m. i dont know what i did wrong. i then tried using the acceleration due to gravity, 9.81 m/s^2 because it is a freefall but the answer was still wrong.

please help!!

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Newton's fundamental laws

**Physics Forums | Science Articles, Homework Help, Discussion**