Question

a car moving with a speed of 8 km/h stops in 4 seconds when the brakes are applied.how much force is applied by the brakes on the car if the weight of the car with its passengers is 800 kg

Answer 1

A car moving with a speed of 8 km/h stops in 4 seconds when the brakes are applied.how much force is applied by the brakes on the car if the weight of the car with its passengers is 800 kg

Given that:

u=8km/hr=2.2m/s

v=0 and t=4 sec

Now using the relation,

v=u+at

0=2.2+4a

a= - 0.56m/s^2

Now force F=ma, can be calculated.