Question

Three initially moving objects are brought to rest (in our reference frame) by a force

(not

necessarily the same in the three cases).

Rank

these cases from

greatest magnitude of Work

done by the force to least magnitude of Work done by the force

.

I. mass = 2 kg initial speed = 8 m/s time to stop = T

II. mass = 4 kg initial speed = 4 m/s time to stop = T

III. mass = 4 kg initial speed = 4 m/s time to stop = 2T

I should be greater than II and II should equal III and I cant get that mathematically

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