Question

A 1000 kg car, traveling to the right at 65 mph, collides with a brick wall and comes to rest in 0.22 seconds. What is the magnitude of the average force the car exerts on the wall? Round your answer to the nearest integer.​

A 0.4 kg softball is pitched to you at 20 m/s. You hit the ball back along the same path, and at the same speed. If the bat was in contact with the ball for 0.27 seconds, what is the magnitude of the average force the bat exerted? Round your answer to the nearest integer.​

Answer 1

here.

a)

mass , m = 1000 kg

initial speed , u = 65 mph = 28.6 m/s

time taken , t = 0.22 s

the magnitude of the average force the car exerts on the wall , F = m * u /t

F = 1000 * 28.6 /0.22 N

F = 1.3 * 10^5 N

the magnitude of the average force the car exerts on the wall is 1.3 * 10^5 N

b)

mass of softball ,m = 0.4 kg

initial speed , u = - 20 m/s

final speed , v = 20 m/s

time taken , t = 0.27s

the magnitude of the average force the bat exerted , F = I/t

F = m * ( v - u)/t

F = 0.4 * ( 20 - (-20))/0.27 = 59.3 N