# Projectile Motion-Shooting a Ball

by atbruick
Tags: ball, motionshooting, projectile
 P: 22 Projectile Motion-Shooting a Ball I think you are using all the right equations but you need to be careful with minus signs. If you are regarding upwards as positive (a good idea) then your expression for y should read: $$Y=Y_0+V_y(0)+\frac{1}{2} a t^2$$ Then you can consider in which direction acceleration due to gravity points. Also watch out for rounding errors. You might find that you need more decimal places in your value for Vx and Vy.