Question

Calculate the work required to be done to stop a car of 1500kg moving at a velocity of 60 km/h?​

Answer 1

Answer:

Given mass of car (m) = 1500 kg

velocity, v = 60 km/h = 16.67 m/s $60 \times \frac{5}{18}=16.67\ ms^{-1}$

Kinetic energy  =  $\frac{1}{2} mv^2$

⇒ Kinetic energy =  $\frac{1}{2} \times 1500 \times 16.67^2=208416.7\ J=208.4\ kJ$

In order to bring the car to rest , the  of car Kinetic energy  should be 0. So the work need to be done is 204.4 kJ.