i found my mistake here .........don't worry about the g .......g cancel out from equation
12) is same as 11)......the only difference is u have to find initial speed instead of angle ........if u don't understand than i can explain u
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just one doubt
why did we use -0.5 and 3.5
why not use 0.5 as positive and keep 3.5 as 4
will we get the same answer?