Question

calculate the work done required to stop a car of mass 50 kg moving witha velocity of 54 km/h​

Answer 1

Answer:

ur answer is in attachment.

thanks❤

Answer 2

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

K.E= ½mv²

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=54km/hr=15m/s

So, magnitude of work that needs to be done = -½mv²(negative sign is used for as wevuse a opposite force to stop the car .)

Hence, work required to stop the car = -½×50×15×15=(-5625)J