1# Projectile motion23- Horizontal velocity ($v_x$) remains constant if no drag45- Vertical acceleration ($a_y$) $= -g$67## Calculating velocity from $x$ and $y$ components89${\displaystyle v={\sqrt {v_{x}^{2}+v_{y}^{2}\ }}}$1011## Displacement1213$x=v_{0}t\cos(\theta)$14$y=v_{0}t\sin(\theta )-{\frac {1}{2}}gt^{2}$1516## Maximum height of an arc1718$h={\frac {u^{2}\sin ^{2}(\theta )}{2g}}$1920## Time of flight21$y=u\ t\sin(\theta )-{\frac {1}{2}}gt^{2}$