How much work can a bow with 50 pounds of tension do when it is fully stretched?

Bow tension generally refers to the maximum tension, so different types of bows have the same tension and different energy. For example, a 50-pound compound bow is usually more energetic than a 50-pound recurve bow. Moreover, there is another parameter that you haven't given, that is, the pulling distance. There is no way to calculate the tension without calculating the distance.

Try to make a hypothesis:

Recurve bow, bow 8 inches, pull 28 inches, and the tension curve is straight. So the average pulling force is 25 pounds. The working distance is 20 inches.

A force of 25 pounds is about 1 1 kg,11Newton. 20 inches is about 0.5 meters. Therefore, the bow is fully stretched and does about 55.5 joules of work.