The drawing shows three identical springs hanging from the ceiling. Nothing is attached to the first spring, whereas a W = 4.20-N block hangs from the second spring. A block of unknown weight hangs from the third spring. From the drawing, determine the spring constant (in N/m) and the weight of the block hanging from the third spring.

Question

(a) the spring constant
N/m

(b) the weight of the block hanging from the third spring

Answer 1

without the drawing...

Answer 2

Coming from another student.... well done sir. I'm not gonna end up getting this right, but for future answers:
first spring: 20cm
second spring: 35cm
third spring: 50cm