a 1000kg car has a speed of 32 m/s. If it takes 7s to stop the car, what is the impulse and average force acting on the car.

V = Vo + a*t = 0.

32 + a*7 = 0,
a = -4.57 m/s^2.

F = M*a = 1000 * (-4.57) = -4570 N. in opposite direction.