Physics questions(double checking my work, only answer, no show work)?

[Joe G]

1)A motorcycle and rider have a total mass equal to 300 kg. the rider apples the brakes, causing the motorcycle to accelerate at a rate of -5m/s^2, What is the net force of the motorcycle?
2)A sprinter with a mass of 80kg accelerates from 0 m/s to 9m/s in 35s
A) what is the runner acceleration?
b)what is the net force of the runner?
c)how far does the sprinter go during the 35s?
3)as a baseball is being caught, its speed goes from 30 to 0 m/s in about 0.0055. It's mass is 0.145kg
a)what is the baseball's acceleration in m/s^2 and g's
b)what is the size of the force acting on it?