Correct Answer - Option 3 : 150 N
Explanation:
In a single string system of pulleys:
Velocity ratio = n
where n = number of strings between fixed pulley block and movable pulley block.
Considering 100% efficiency:
Mechanical advantage = Velocity ratio = n = 6
Mechanical advantage = \(\frac{Weight}{Tension}=6\)
Tension = Weight/6 = 3000/6 = 500 N
So, Thrust of man on ground = W - T
= (650 - 500) = 150 N