Answers

2014-04-18T23:27:34+05:30
It is a free fall motion with acclereation due to gravity a=10m/ s^{2}
from laws of motion
v=u+at
s=ut+(1/2at^{2}
but u=initial velocity=0
20=1/2*10*t^{2}
t^{2} =4
t=2 seconds
final velocity v=10*2=20m/s
1 5 1
thanks a lot!!!!!!!!!!!!!!!!!!!!!!!!!!
2014-04-19T15:15:33+05:30
Time is 2 seconds
The velocity is 20m/s

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