Momentum problems

I am currently doing my physics homework for momentum and I'm not 100% sure if my answers are right, and I hope someone can confirm it is either correct or not.

Q1) In a simulated accident, a car of mass 800 kg is travelling towards a wall. Just before impact, the speed of the car is 32ms^-1. It rebounds at two-thirds of its initial speed. The car takes 0.50s to come to rest.

(i) Calculate the change in momentum of the car
Δp = m(v-u) Δp = 800((-64/3) - 32) Δp = -42666.67kg ms^-1

(ii) The magnitude and direction of the average force acting on the car during impact
F=(mv-mu)/t F=(-25600)/0.5 F=51200N opposite to initial direction of motion
...

I am currently doing my physics homework for momentum and I'm not 100% sure if my answers are right, and I hope someone can confirm it is either correct or not.

Q1) In a simulated accident, a car of mass 800 kg is travelling towards a wall. Just before impact, the speed of the car is 32ms^-1. It rebounds at two-thirds of its initial speed. The car takes 0.50s to come to rest.

(i) Calculate the change in momentum of the car
Δp = m(v-u) Δp = 800((-64/3) - 32) Δp = -42666.67kg ms^-1

(ii) The magnitude and direction of the average force acting on the car during impact
F=(mv-mu)/t F=(-25600)/0.5 F=51200N opposite to initial direction of motion

Q2) A cricketer throws a ball of mass 0.16kg. The ball starts from rest and is thrown horizontally. (The area under the F*t graph is 3.84Ns)
(i) Calculate the speed of the ball, mass 0.16kg when it is released.
v=Δp/m 3.84/0.16 = 24

(ii) Calculate the maximum horizontal acceleration of the ball
I have no idea, I have tried various equations and either gotten a=75 or 150, which seems absurd

Q2) A cricketer throws a ball of mass 0.16kg. The ball starts from rest and is thrown horizontally. (The area under the F*t graph is 3.84Ns)
(i) Calculate the speed of the ball, mass 0.16kg when it is released.
v=Δp/m 3.84/0.16 = 24

(ii) Calculate the maximum horizontal acceleration of the ball
I have no idea, I have tried various equations and either gotten a=75 or 150, which seems absurd

For the Q2ii) is there some graph or something which shows the force against time?

As for (ii), it seems that you need info from the graph of F vs time, to find the max force and use F = ma to calculate max horizontal acceleration.

There was a graph but for some reason I cannot attach it. The maximum force was 24N but when I substitute the values into F=ma, 24=0.16a, the acceleration is 150ms^-2 which seems too ridiculous.

This is the graph (link below). I couldn't directly attach it and I'm not 100% sure if I can use imgur links, but I'm sure someone will take it down if it's not allowed. The maximum force was 24N but when I substitute the values into F=ma, 24=0.16a, the acceleration is 150ms^-2 which seems too ridiculous.
https://imgur.com/a/IvPhTmm