In an ideal pulley system, a woman lifts a 100 n crate by pulling a rope downward with a force of 25 n. for every 1 meter length of rope she pulls downward, the crate rises. a. 50 cm. b. 45 cm. c. 25 cm. d. none of these.

The crate rises up 25 cm.    

Explanation:

It is given that,

Weight of crate, W₁ = 100 N

A woman lifts a crate by pulling a rope downward with a force of, W₂ = 25 N.    

For every 1 meter length of rope she pulls downward, the crate rises.

d₁ = ?

d₂ = 1 m = 100 cm

It can calculated by using by the following relation :

W(input) = W(output)

d₁ = 25 cm

Hence, for every 1 meter length of rope she pulls downward the crate rises upto 25 cm.