A mass on a vertical spring begins its motion at rest at $y = 0\  cm$. It reaches a maximum height of $y = 10\  cm$. The two forces acting on the mass are gravity and the spring force. The graph of its kinetic energy ($KE$) versus position is given below. Net force on the mass varies with $y$ as
  • A$F = 4y - 20$
  • B$F = 20 - 4y$
  • C$f = \frac{8}{25}(y - 5)$
  • D$f = \frac{8}{25}(5 - y)$
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