(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I just came across this question and i think its giving me a real hard time.

This is part of a bigger question so I'll provide the other statements below

7 The maximum height reached by the ball is

approximately

(1) 1.2 m (3) 4.9 m

(2) 2.5 m (4) 8.5 m

2. Relevant equations

t=1 s and therefore half way is 0.50s

V(i)=8.9m/s

angle is 35 degrees

Viy= 4.9m/s

3. The attempt at a solution

First of all, why is it that I can't use certain formulas in Solving some motion problems even though everything seems to work ok. I tried using this formula....d=V(i)t +1/2at^2... but my answer turns out wrong. and this one rather gives me the answer...Vf^2=Vi^2 + 2ad.......why is that?

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# Homework Help: Solve it using energy conservation?

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