A pulley system is marked with a Mechanical Advantage of 2.5. A worker applies 450N to the pulley in an attempt to lift a sound system with a 1500N weight. Of this task we could say that:
The work done by the worker will be lower than the work done by the pulley system while lifting the sound system.
It is impossible ta lift the sound system using a pulley system, you must use a third-class lever.
It is impossible to lift that much weight with this system so no movement should be observed.
The mechanical advantage must be incorrect, as the mechanical advantage can not have decimals
The correct statement is: The work done by the worker will be lower than the work done by the pulley system while lifting the sound system.
The mechanical advantage of a pulley system indicates how much easier it makes it to lift a load compared to lifting it directly. A mechanical advantage of 2.5 means that the pulley system allows the worker to lift the load with 2.5 times less force than lifting it directly. In this case, the worker is applying 450N of force, which is lower than the weight of the sound system (1500N). Therefore, the work done by the worker will be lower than the work done by the pulley system while lifting the sound system.