Answer:
7.2 KN
Explanation:
Given the car is travelling at 30 m/sec and the weight of the car is 1200 kg
Also given that teh time in which the car should be stopped is 5 sec
let the amount of force which should be applied be F
We Know that Impulse = Ft = change in momentum = momentum after - momentum before
We know that Momentum= mv
Momentum after force applied = 0 (∵ the car stops and velocity = 0)
Momentum before the force applied = mv = [tex]1200\times 30[/tex] = 36000 kg m/sec
Impulse = [tex]F\times 5[/tex]
[tex]F \times 5 = 36000[/tex]
F = 7200N = 7.2KN
