Question

A car of mass 1200kg is moving withSpeed of 72km/hr is brought to rest in 20sec.find the force required to stop the car

Answer 1

Solution :

Here;

Mass, m = 1200kg

Velocity, v = 72km/h

time given, t = 20 second

And, the body is coming to rest so ,
final velocity, v = 0km/h

Now , F = ma [but acceleration is not given]

so; a = (v-u)/t

= 0-72/2

= -36km/h^2

Now, F = 1200* (-36)

=> F = -43200 N

Hence, 43200 N force needed to stop car.

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