Newton's laws, finding acceleration and force

[jevillan]

Homework Statement

A large football player student (1.0 x 10^2 kg) applies a 6.0 x 10^2 N force to another equally burly student (1.0 x 10^2 kg) sitting on a sled (13.2 kg). If sliding friction and air resistance (drag) is 99.5 N, find the acceleration of the sled. In addition, how much force does the football player need to apply to the ground to accomplish this feat? Remember, he needs to get himself moving too!

Homework Equations

Fnet = ma
Fg = mg
a = ?

The Attempt at a Solution

Fapp = 600 N
Fnet = 600 - 99.5 = 500.5 N
Fnet = ma
500.5 = (100 + 13.2)a
a = 4.42 m/s/s

Acceleration of sled = 4.42 m/s/s

"how much force does the football player need to apply to the ground to accomplish this feat"

m of football player: 100 kg
Fg = 100*9.8 = 980 N
Force football player needs to apply: 980 N

I don't think I did that last part of the question right. How do I find the force the football player needs to apply?

 

[PhanthomJay]

Your first part looks good. In part 2, the problem is asking what horizontal force must be applied by the player to the ground in order for both the players and the sled to accelerate at that rate.