A ball is placed on the spring and launched vertically, Find k

[Alexanddros81]

Homework Statement

14.28 The spring of stiffness k is undeformed in the position shown. The 30-g ball
is placed on the spring and launched vertically by compressing the spring 150mm and
releasing it. If the ball reaches an elevation of 14.25m above A, determine the value of
k.

Homework Equations

The Attempt at a Solution

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The solution given is 36.7 N/M. So is it my mistake or the book is wrong?
Can you check my solution?

 

[TSny]

I believe your solution is correct. I suspect that the answer provided is a misprint.