What is the average force exerted on the ball by the floor during the bounce?

[recoil33]

1. A rubber ball of mass 80.0 g bounces vertically on a concrete floor. The ball strikes the floor at 10.0 m s–1 and rebounds at 8.00 m s–1.
The time of contact between the ball and the floor during the bounce was 0.0500 s



2.
a) Calculate the average net force acting on the ball during its contact with the floor.

b) Calculate the average force that the floor exerts on the ball.


My attempt of a solution:
A)

a = ΔV/ΔT

10-8 = 2
2 / 0.050 = 40

F = ma
0.08 x 40
= 3.2

B) Well, The force that the floor would exert. I don't know where to start!
Any advise on equations or ways to approach a problem such as this.

Thanks, Recoil33

 

[rock.freak667]

[
B) Well, The force that the floor would exert. I don't know where to start!
Any advise on equations or ways to approach a problem such as this.

Thanks, Recoil33

Newton had 3 laws, the third law should help you here.