Question

A car of mass 1200 kg is moving with a constant Speed of 36km/h. The net force acting on a car is ?

Answer 1

Answer:

3000 N is the answer

Explanation:

Here, m=1200 kg u=36*(1000/3600)m/s = 10 m/s

v=0 m/s and s=20 m

v^2-u^2=2as

0-(10)^2=2a(20)

-100=2a(20)

-5=2a

therefore, a=-2.5 m/s^2

We know that F=ma

Therefore, F=1200*(-2.5)

F= -3000 N

The force applied by the breaks is 3000 N.

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Answer 2

Given :

The mass of the car = 1200 kg

The speed of the car =  36 km/h = 10 m/s

To find :

The value of the net force acting on the car .

Solution :

Force , F = mass * acceleration

=> F = m * a

=> F = m * ( Change in velocity / time)

as speed is constant , then change in velocity is zero ,

=> F = 1200 * 0

=> F = 0

The value of the net force acting on the car is zero as the speed is constant .