Question

Tori experiments with pulleys in physics class.She applies 70 newtons of force to a single pulley to lift a bowling ball. By adding another pulley, she’d get a mechanical advantage of 2. What’s the minimum input force she’ll need to lift the ball if she adds another pulley? A. 2 N B. 35 N C. 68 N D. 70 N E. 140 N

Answer 1

Maybe its 140 N . I'll just post this.