Question

Hey Guys
Tell me that - if a car of mass 480kg moves at a speed of 54km/hr is stopped by applying brakes in 10s. What will be the force applied by the brakes.
Explain it nicely. ​

Answer 1

Answer:

Explanation:

Mass = 480 kg

Speed = 54 km/h = 54*5/18 = 15m/s

Final velocity = 0 m/s

Time = 10 seconds

Acceleration = (0-15)/10 = - 15/10 = 1.5m/s

But here we are calculating the force applied by brakes so it will be taken positive.

Force = mass*acceleration

= 480*1.5 Newton

= 720 Newton

So, 720N force is applied.