2 Trajectory of a projectile
Recall Newton's second law of motion: if at any time t, a force F(t) acts on an object of mass m producing an acceleration ⃗a(t), then ⃗F(t) = m⃗a(t). 1. Let's define v0 = ∣⃗v0∣ (we're just renaming the initial speed, or the magnitude of the initial velocity).