v = dx/dt       ,         a = dv/dt =d2x/dt2

v = v0 + a t

x = x0 + v0 t + 1/2 a t2

v2 = v02 + 2 a x

Fnet = m a

FR = (m v2)/R

F = G m1 m2/ r2

W = F (cos θ) d

Wnet = Δ KE

KE = 1/2 m v2

PEg = m g y

PEs = 1/2 k x2

g = 9.8 m/s2

G = 6.67 x 10-11 Nm2/kg2