Question

a.......,.... helps a trolley to move across the rope​

Answer 1

Pulley is the answer.

Answer 2

Answer:

A Pulley helps a trolley to move across the rope​.

It makes the task easy and fast. the use of pulley is growing high in the modern days. This is mainly used in the construction industry to cut down the labour cost and to move the loaded materials in an easy manner.

There are many manufacturing companies provide the pulley to the construction industries.