5. A 0. 500 kg model rocket is initially pushed upwards by a thrust force of 15 n. If the force of air resistance is 1. 00 n, what is the initial acceleration of the rocket?.

Two steel balls, each of mass m, are welded to a light rod of length l and negligible mass and are initially at rest on a smooth horizontal surface. a horizontal force of magnitude f is suddenly applied to the rod as shown. determine (a) the instantaneous acceleration a of the mass center g and (b) the corresponding rate at which the angular velocity of the assembly about g is changing with time.