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A spring of spring constant 5 xx 10^(3) ...

A spring of spring constant `5 xx 10^(3) N//m` is stretched initially by 5 cm from the unstretched position. The work required to further stretch the spring by another 5 cm is .

A

12.50 N - m

B

18.75 N-m

C

25.00N-m

D

6.25 N-m

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The correct Answer is:
B
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