$$ |a→| = g = 9.8 m/s^2 (magnitude) $$
$$ a→ = -gĵ = -9.8 m/s^2 ĵ $$
$$ v→ = v0→ + a→t $$
$$ ∆r→ = v0→t + 1/2 a→ t^2 $$
$$ ∆y = ∆x tan(θ) - (g∆x^2 / 2 v0^2 cos^2θ) $$
$$ t = ∆x / v0 cos(θ) $$
