Can someone pls explain how to answer these

Explanation:

Hook's law describes the force F a spring exerts on an object that is stretched or compressed by a distance x from its natural length and has spring constant k:

(1)

The force of gravity of an object with mass m and gravitational acceleration g is given by:

(2)

(a) To find the natural length l of the spring you can use the example 1 and 3 of the spring. Use equations 1 and 2 to get the following system of equations with two unknowns k and l:

To solve for k you can subtract the equations:

Now plug in k to solve for l:

(b) Now use Hook's law to find x:

(c) Do the same to find the mass m:

(d) Work is given by:

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