I'm not sure how to get started on this:
Solve initial value problem for r as a function of t
Differential equation: d^2r/dt^2 = -(i + j + k)
Initial conditions: r(0) = 10i +10j +10k and (dr/dt) evaluated at t=0 =0
I'd appreciate all the help I can get; truthfully, I'm pretty lost in this course and regretting taking it at all.