Posted by Anonymous on Sunday, January 27, 2013 at 9:59am.
4rm eqns of motion
s=ut + 1/2at^2
since u =0
s=1/2at^2
25=0.5*2.5 *t^2
t^2=25/1.25
t^2=20secs^2
t=4.5secs
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