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An elastic string of force constant 200N m-1 is stretched through 0.8m within its elastic...

Physics
WAEC 2004
An elastic string of force constant 200N m-1 is stretched through 0.8m within its elastic limit. Calculate the energy stored in the string
  • A. 64.0J
  • B. 80.0J
  • C. 128.0J
  • D. 160.0J
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Correct Answer: Option A
Explanation
E = \(\frac{1}{2}Ke^2\)

= \(\frac{1}{2} \times 200(0.8)^2 = 64J\)
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