Question

The breaking force needed to bring the car of maas 1200 kg to rest in 5 second. What it is moving at 20 m/s?​

Answer 1

Answer:

-4800 Newtons

Explanation:

Given :

• Initial velocity = u = 20 m/s

• Final velocity = v = 0 m/s

• Time taken = t = 5 seconds

• Mass of the car = m = 1200 kg

To find :

• The breaking force required to stop the car

Force = Mass×Acceleration

Acceleration = (v-u) /t

So force can be rewritten as :

Force = mass(final velocity - Initial velocity) / time

Force = 1200(0-20)/5

Force = 1200(-20)/5

Force = - 24000/5

Force = - 4800 Newtons

The breaking force required to stop the moving car at a velocity of 20 m/s to 0 m/s is equal to -4800 Newtons

NOTE : the force is negative as it is in the direction of movement of car