Which is.. P= mv. However in this question you are not given a velocity, maybe you just guess one. I will call it V. The impulse is mV in the forward direction.

b) You want to understand that force is the RATE OF CHANGE OF MOMENTUM. F=dP/dt,
↑↑↑↑↑↑↑↑↑↑↑
Important !

Therefore P= Impulse = I = ∫Fdt
If you pretend the force is constant then don’t need to integrate and you have P=I=FΔt
V is the velocity of the club
To find the time the ball is in contact use v=d*t
P=I=mV=FΔt , you can solve for F

2) This is easier then the first one.Again remember an impulse is an amount of momentum, or, P=I= mv. Find the difference in velocity, and plug it into I=mv
Assume the force is constant and use P=I=FΔt

3) use the conservation of momentum law.
4)
a) Because of the conservation of momentum law the change of velocity of the truck will be less. (greater mass)
b) This part is hard.
Use the conservation of momentum to find the final velocity of the car and truck stuck together.
v₁m₁ +v₂m₂ = v(m₁+m₂)
Then calculate the change in velocity of the driver.
You know his mass and therefore his change in momentum
Assuming the force is constant you can use the simple version of the impulse equation. P=I=FΔt, solve for F

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