Question

a car of mass 1000kg moving with a velocity of 45 kmh -1 collides with a tree and comes to rest in 5 seconds what will be the force exerted by the car on the tree​

Answer 1

Answer:

MASS OF CAR = 1000 KG.

INITIAL VELOCITY OF CAR = 45 KM/H =45×5/18=12.5 m/s

FINAL VELOCITY BECOMES 0 M/S

AS IT CAME TO REST.

TIME TAKEN = 5 SEC.

ACCELERATION = V-U/T = 0-12.5/5=-12.5/5=0.25 M/S^2

WE HAVE TO FIND FORCE EXERTED BY THE CAR ON THE TREE.

WE KNOW,

F=MA=1000×0.25=250 N

HENCE FORCE EXERTED BY THE CAR 250 N.