a mass m is subject to a resistive force -bv but no springlike restoring force. (a) show that its displacement as a function of time is of the form where γ = b/m. (b) at t = 0 the mass is at rest at x = o. at this instant a driving force f = fo cos ar is switched on. find the values of a and δ in the steady-state solution x a cos(wt-5). (c) write down the general solution [the sum of parts (a) and (b)] and find the values of c and vo from the conditions that x -0 and dx/dt = 0 at t 0. sketch x as a function of 1.