Janet wants to find the spring constant of a given spring, so she hangs the spring vertically and attaches a 0.40 kg mass to the spring’s other end. If the spring stretches 3.0 cm from its equilibrium position, what is the spring constant?
Answer:
mg = kx
k = mg/x
k = 0.40(9.8)/0.030
k = 130.66666…
k ≈ 130 N/m