Question

a car of mass 1000kg moving with the velocity of 45 km/hr collides with a tree and comes to stop in 5 seconds calculate the force exerted by a car on tree​

Answer 1

Your answer is in the above attachment. (=-2500N)

Answer 2

Answer:

Explanation:

Mass of the car, m = 1000 kg

Initial speed of the car, u = 45 km/hr = 12.5 m/s

It stops so v = 0

Time taken, t = 5 s

Force exerted by the car on the tree can be calculated by using the formula:

F=ma

But v=u+at

a= (v-u)/t

 = (0-12.5)/5

 = -12.5 / 5

 = - 2.5 m/s

Thus F= 1000* -(2.5)

          = - 2500 N

 -ve sign shows that the car was retarded

Hope this helps