7. Consider an object that accelerates from rest along 1-dimension with time-dependent acceleration given (in SI units) by a(t) = 2.0t + 3.0. How far has the object moved in 5.0 seconds? 8. Consider a solid cylinder of radius R and length _ = 2R and a solid sphere of radius R, both have non-uniform mass density given by p(r) = po(1 -"/p). Calculate the total mass of the solid cylinder and the solid sp