an onject of mass m is moving with a constant velocity,v.how much work should be done on the object in order to bring the object to rest?work and energy lesson
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initial velocity = v
final velocity should be 0 ( Zero ) to bring it to rest.
So
0 = v^2 + 2as
=> 2as = -v^2
=> as = -1/2v^2
Word done = F.S = ma * s = -1/2mv^2 .
final velocity should be 0 ( Zero ) to bring it to rest.
So
0 = v^2 + 2as
=> 2as = -v^2
=> as = -1/2v^2
Word done = F.S = ma * s = -1/2mv^2 .
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