Question

Only genuine answers required.​

Answer 1

Explanation:

1) Not necessary. in a given time interval the body can make a to and fro motion such that the displacement is zero( distance will be non zero)

2)

$v = u + at \\ but \: since \: uniform \: motion \\ a = 0 \\ so \\ v = u \:$

3) negative initially, will be zero at top and positive thereafter

4) acceleration is zero

velocity is 20m/sec

distance in 15 secs is 20*15=300mtrs