Equation found in previous question is #: x''=gsin(a)-b(v^2)
1. Rewrite the equation # as a differential equation for v as a function of x.
2. Solve the equation to find v as a function of x.
Relevant equations: v=x'=dx/dt, x''=v'=a=dv/dt
Attempt at 1: Using the relevant equations you can...