Final answer:
A vector 2 cm long, drawn to the same scale where 1 cm represents 5 N, would represent 10 N.
Step-by-step explanation:
If a vector that is 1 cm long represents a force of 5 N, then a vector that is 2 cm long, drawn to the same scale, represents a force that is twice as large. To find the force that a 2 cm vector represents, you simply scale up the force proportionally. So, if 1 cm corresponds to 5 N, then 2 cm would correspond to 10 N.