please help me?

If Sheila has to pull 5 m of rope to move an object up to her tree house using a fixed pulley, how much rope will she have to pull if she attaches a moveable pulley to the object?

5 m
2.5 m
10 m
20 m

Question

please help me?

If Sheila has to pull 5 m of rope to move an object up to her tree house using a fixed pulley, how much rope will she have to pull if she attaches a moveable pulley to the object?
 	
	5 m
	2.5 m
	10 m
	20 m

mathmale · Answer

Pulleys provide mechanical advantage.  In exchange for having to pull more rope through the fixed pulley, this system enables the user to lift heavier loads with the same amount of pull.

So, if this girl has to pull in 5 m of rope to lift a certain object to her tree house, would she have to pull in more or less rope if she adds a pulley to the load?|dw:1451273294594:dw|