To calculate the IMA (Ideal Mechanical Advantage) of a pulley system, we can use the formula:

IMA = (Distance the effort force moves) / (Distance the load moves)

In this case, the distance the effort force moves is 10 meters (as mentioned in the question), and the distance the load moves is 2 meters. Therefore, the IMA can be calculated as:

IMA = 10 / 2 = 5

The IMA represents the theoretical advantage of the pulley system.

The AMA (Actual Mechanical Advantage) of a pulley system takes into account factors such as friction and other losses. In an ideal pulley system without any losses, the AMA would be equal to the IMA. So, in this case, the AMA is also 5.

Efficiency is defined as the ratio of output work to input work, expressed as a percentage. In a pulley system, the output work is the work done on the load (weight lifted), and the input work is the work done by the effort force. Since the effort force is two newtons and the load is five newtons, the efficiency can be calculated as:

Efficiency = (Output work / Input work) * 100
= (5 / 2) * 100
= 250%

Therefore, the efficiency of the pulley system is 250%.