The SI unit of spring stiffness k is

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Multiple Choice

The SI unit of spring stiffness k is

Explanation:
Spring stiffness relates force to displacement and is defined by F = kx. Because F is in Newtons and x is in meters, the unit of k is Newtons per meter, N/m. This fits the idea that stiffness tells you how much force is needed to produce a given stretch or compression. The energy stored in a spring is (1/2)kx^2, which with k in N/m and x in meters gives joules, confirming the consistency of the unit. The other units don’t match: joules are energy, newtons are a force, and newtons per square meter are pressure.

Spring stiffness relates force to displacement and is defined by F = kx. Because F is in Newtons and x is in meters, the unit of k is Newtons per meter, N/m. This fits the idea that stiffness tells you how much force is needed to produce a given stretch or compression. The energy stored in a spring is (1/2)kx^2, which with k in N/m and x in meters gives joules, confirming the consistency of the unit. The other units don’t match: joules are energy, newtons are a force, and newtons per square meter are pressure.

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