Solve the problem.A 20-kg mass is attached to a spring that hangs vertically and is stretched 3 m from the equilibrium position of the spring. Assume a linear spring with F(x) = kx. How much work is required to compress the spring and lift the mass 1.5 m? Round to four decimal places when appropriate.
A. 24.5 J
B. 318.5 J
C. 220.5 J
D. 514.5 J
Answer: D
Mathematics
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+ 
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B. 
+ 
= 
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+ 
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D. 
+ 
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