A mass is attached to a vertical spring with spring constant

PHYSICS · Single correct · A Level · Physics · Further mechanics and thermal physics · Further mechanics and thermal physics

Problem

k=75\,\text{N}\!/\!\text{m}

. The mass is pulled downward

15\,\text{cm}

from equilibrium and held at rest. What is the magnitude of the restoring force exerted by the spring on the mass while it is held? (a)

5.6\,\text{N}

(b)

11.3\,\text{N}

(c)

0.75\,\text{N}

(d)

1.69\,\text{N}