Determine the gross force needed to bring a car which is tra

Determine the gross force needed to bring a car which is traveling at 110 km/hr to a full stop in a distance of 100 m. The mass of the car is 2100 kg. What happens to the initial kinetic energy, where does it go or to what form of energy does the kinetic energy convert to?

Solution

LETS SUPPOSE TO BRING CAR AT REST ,THERE IS CONSTANT DEACCELERATION a IN IT.

so

intial velocity u =110 km/hr=30.56 m/s

final velocity=0m/s

desitance travelled s =100 m

so we know that

v²=u²+2as

0= 30.56²+2*a*100

a= -4.668 m/sec²( negative value shows direstion of acceleration is opposite to the motion)

force = mass *a=2100*4.668=9803.241 Newton

The kinetic energy converts to heat energy as result of friction beetween brake\'s plates and tyres.