Posted by Joel on Monday, January 17, 2011 at 1:24pm.
Hint: It takes the same amount of time to go up, as it does down, so use 2.5 as t. And your only acceleration will be gravity acting downwards.
Figure out a, and vi, then put them into one of your kinetic formulas and you should get your answer.
A ball is thrown vertically into the air and takes 5s to return to the thrower, from time of projection. What is the time it takes to reach maximum height ?
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