A vertical spring has force constant

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

Problem

25\,\text{N}\!\cdot\!\text{m}^{-1}

. When a small platform is hung from the spring, the system oscillates with a measured period of

0.80\,\text{s}

. Assuming the spring’s mass is negligible, what is the mass of the platform? (a)

1.6\,\text{kg}

(b)

0.20\,\text{kg}

(c)

0.41\,\text{kg}

(d)

1.0\,\text{kg}