13-3. The 300-kg bar B, originally at rest, is being towed over a series of small rollers. Determine the force in the cable when 5 s, if the motor M is drawing in the cable for a short time at a rate of v = (0.412) m/s, where r is in seconds (0 ≤ 6s). How far does the bar move in 5 s? Neglect the mass of the cable, pulley, and the rollers. M B