Question

The mean compression of each spring is 3.5 × 10–3 m
Calculate the spring constant of each spring in the mattress.
Give the unit.

Answer 1

The mean force on each spring in the mattress is 0.49 N

$$k=\frac{F}{x}\\k=\frac{0.49}{3.5\cdot10^{-3}}=140\frac{N}{m}$$