If Susan and Jake made the force arm 0.2m instead of 3.2m then what is the mechanical advantage? Is this easier or harder to lift the load. If given force - IMA = Resistance force (output) ÷ Effort Force (input)
Please show me how to do it step by step

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?