parachute problem?

Question

A parachutist relies on air resistance (mainly on her parachute) to decrease her downward velocity. She and her parachute have a mass of 57.5 kg and air resistance exerts a total upward force of 660 N on her and her parachute.

What is the combined weight of the parachutist and parachute in newtons?
Calculate the net force on the parachutist.
What is the magnitude of the acceleration of the parachutist?

Answer 1

Wt=W person + W parachute
Wt=(m person + m parachute )g
Wt= 57.5 x 9.81= 564 N

The net force
Fn= Wt- Fw= 564 N - 660N


F=ma so
a= Fn/m