Answers

2015-06-27T11:46:02+05:30
after 32 seconds. Just apply v = u + at
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2015-06-27T13:53:28+05:30
The velocity will keep decreasing and it will reach 0 and then it will reverse.
So just before reversing, the velocity will be 0.

Initial velocity = 48 m/s
final velocity = 0
acceleration= -1.5 m/s²

v= u + at
⇒0 = 48 - 1.5t
⇒ t = (-48) / (-1.5) = 32s

At 32s, it will be 0. So velocity will be reversed just after 32s.

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