Posted by Autumn on Monday, October 25, 2010 at 4:37pm.
A projectile staying in the air for t seconds spends half the time going up and half going down.
Since it is a deceleration, we can think of it a being dropped from the highest point and stayed in the air for 2.5 seconds.
S=ut+(1/2)gt²
=0+(1/2)g*2.5²
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