A car of mass 1000kg is travelling at 20m/s when it
collides with a wall.
The front of the car collapses in 0.1 seconds,
by which time the car is at rest.
Calculate the deceleration of the car.
Calculate the force exerted by the wall on the car.

Deceleration=200m/s^2

Force = -2 × 10^5

Explanation:

initial velocity u = 20m/s final velocity v = 0m/s time t =0.1s

v= u + at

0 =20 +0.1a

0-20 = 0.1a

-20/0.1 = 0.1a/0.1

a= -20/0.1

a= -200m/s^2

F = m(v-u)/t

F = 1000(0-20)/0.1

F=1000 × -20/0.1

F=1000 × -200

F = -2× 10^5N

colorectal cancer may also develop from areas of abnormal cells in the lining of the colon or rectum. this area of abnormal cells is called dysplasia and is more commonly seen in people with certain inflammatory diseases of the bowel such as crohn's disease or ulcerative colitis.