95. An object's velocity as a function of time is given by v(t) = bt – ct, where b and c are positive constants with appropriate units. If the object starts at x= 0 at time t=0, find expressions for (a) the time when it's again at xr = 0 and (b) its accel

95. An object's velocity as a function of time is given by v(t) = bt – ct, where b and c are positive constants with appropriate units. If the object starts at x= 0 at time t=0, find expressions for (a) the time when it's again at xr = 0 and (b) its acceleration at that time.