A ball of mass 100 g is dropped from a height h=10 cm on a platform fixed at the top of a vertical spring (as shown in figure). The ball stays on the platform and the platform is depressed by a distance /h2. The spring constant is N m⁻¹. (Use g=10 m s⁻²)

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120. From release to the lowest point the ball drops h+/h2=0.15 m and the spring compresses 0.05 m. mg(0.15)=1/2k(0.05)²⇒0.1×10×0.15=0.00125 k. k=120 N m⁻¹.

A ball of mass 100 g is dropped from a height h=10 cm on a platform fixed at the top of a vertical spring (as shown in figure). The ball stays on the platform and the platform is depressed by a distance /h2. The spring constant is ______ N m⁻¹. (Use g=10 m s⁻²)

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