Question

Calculate the work requried to be done to stop a car of 1500kg moving at speed of 60km/h ?

Answer 1

Answer:

When a object is moving with a constant velocity, it possess K.E

K.E=  

2

1

​  

×m×v  

2

 

So, in order to bring the object to rest i.e its same magnitude of energy is required so, as the final final energy comes to zero.

v=60km/hr=16.66m/s

So, magnitude of work that needs to be done =  

2

1

​  

×m×v  

2

 

Hence, work required to stop the car =  

2

1

​  

×1500×16.66  

2

 =208166.7J=208.17kJ

Explanation: