Question

A parachutist of mass 75kg descends with an acceleration of 8 m/s2. What is the upward force exerted by the air on the parachutist?

Answer 1

the upwards force should be 150 newtons. 
If    mg - f = ma    
then   (75)(10) - f = (75)(8)  
750 - f = 600
f = 150
*the acceleration of gravity is simplified to 10