Answers

2015-12-27T08:01:40+05:30
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 .
0