did this help?Object is projected from a speed of V and an angle of Θ

Horizontal displacement is 15m ,vertical displacement is 5m

Find V and Tan Θ

(right )

x=V cos Θ*t

t=x/V cos Θ

(up)

y=v Sin Θ*t-g/2*t²

instead of using 't' you should have used 't/2' in the above eqn. do you see why?

from first equation y=V sinΘ(x/V cosΘ)-g/2*(x/v cosΘ)²

5=V sin Θ(15/V cos Θ)-g/2 *(15/V cosΘ)² <<<Stuck!!!!

help wanted

Books says 12.5 , 4/3