Question

Calculate the amount of work required to stop a car of 2000 kg moving with a speed of 75 km/ h.​

Answer 1

Answer:

force=speed/weight

Explanation:

answer is 26.6

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Answer 2

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

K.E=21×m×v2

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 =21×m×v2

Hence, work required to stop the car =21×1500×16.662 =208166.7J=208.17kJ

this can help u a little.