4.58 ... CALC The position of a 2.75 105-N training helicopter under test is given by 7 = (0.020 m/s) 13 + (2.2 m/s) (0.060 m/s). Find the net force on the helicopter at t = 5.0 s. - 4.59 CALC An object with mass m moves along the x-axis. Its position as a function of time is given by x(t) = At - Bt, where A and B are constants. Calculate the net force on the object as a function of time. 4.60 CALC An object with mass m initially at rest is acted on by a force = k + kt, where k and k2 are constants. Calculate the velocity (t) of the object as a function of time.