SAT Subject Physics Practice Question 416: Answer and Explanation

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Question: 416

7. A hanging weight stretches a spring 8 cm. If the weight is doubled and the spring constant is not exceeded, how much will the spring stretch?

A. 4 cm
B. 8 cm
C. 12 cm
D. 16 cm
E. 20 cm

Correct Answer: D


The correct answer is (D). Based on Hooke's Law, F = kx where F is mg and x is the elongation. Solving for x = mg/k, so if m is doubled, x is doubled as well.

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