Recent content by GiantYoda

I am not sure if I got your second point. All what I am asking is since all kinematic equations are correct, all should give the same solution. Why isn't this applicable with Δy=[(vyi+vyf)/2]*Δt?

Exactly. According to what I have studied, all the kinematic equations are useable interchangeably as long as the givens allow. Why does this equation yield 0/0?

Givens: Vyi=12.5 m/s Vyf=-12.5 m/s (at the same horizontal level) ay=-9.81 m/s^2 Δy= zero m (as the displacement on the y-axis, when the projectile reaches the same horizontal level, is zero m) Δt=? When I use Δy=[(vyi+vyf)/2]*Δt I get the time as undefined. Δt= 2Δy/(vyi+vyf) = 2*0 m/(12.5...