Question

Calculate the work required to be done to stop a car of 100kg moving at a velocity
of 50km/hr.​

Answer 1

Question ⤵️

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

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.

So, magnitude of work that needs to be done =

2

1

×m×v

2

60km/hr=16.66m/s

So, work required to stop the car =

2

1

×1500×16.66

2

⇒=208166.7J=208.17kJ ✔️✔️✔️