would a tower crane be a first class, second class, or third class?
The crane is balanced, with a fulcum somewhere between the ends. On one end, you have counter weight sometimes can be moved. On the end, you usually have the crane part, which can be trolleyed from the end toward the fulcum. If my memory serves me. a wheel barrow is a type 2, because the fulcum is on the end and the load is toward the middle. So this leaves you with a type 1 or 3. Try searching using the key word group lever type fulcum and I'll bet you get your answer.
Did you open your ME book? The answer is in there.
