Question

How much force is needed to stop a 1200 kg car traveling at 30 m/ s in 5 seconds​

Answer 1

7.2 KN

Step-by-step 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 =
`1200* 30` = 36000 kg m/sec

Impulse =
`F* 5`

`F * 5 = 36000`

F = 7200N = 7.2KN