Hi everyone ,, yesterday I had an exam with the following question :
A ball is vertically thrown from a height (h) then it collide with the ground and went to height (5+h), the whole time of the projectile is 2 seconds .
(a) Find the initial velocity and the time it took until it reached the ground.
(b) Find (h) and the velocity before hitting the ground
The Attempt at a Solution
The question was really hard ,, I didn't really know how to solve it .. I applied the following :
t1+t2=2 ,, and t1 (the time until it reached the ground) and t2(the time until it reached the height (h+5) , the equation of t1 (h=Vot1+0.5*g*t1^2) and for t2 (5-h=(V+gt1)t2-0.5*g*t2^2) and I combined them together and got V=7.5 m/s .. is it right ?? .. is the attempt to solve is even right ??