# Projectiles Up Incline

1. Sep 29, 2006

### cscott

I have my two expressions for time for (b) and (c) but I'm not sure how to use them to get the angles or values for initial velocity.

(b)$$t = \frac{2v_i\sin \beta}{g \cos \alpha}$$
(c)$$t = \frac{v_i cos \beta}{g \sin \alpha}$$

Last edited: Sep 29, 2006
2. Sep 29, 2006

### semc

hmm....i have yet to try the question but looks interesting....IF we were to assume angle alpha-beta to be zero which means the projectile is on a flat ground,does tt mean tt when the projectile hits the ground,Vy=0?