This is my first post...and I hope I am doing this correctly...I know this isn't a place to "get my homework done for me". I just want to know how to do it.(adsbygoogle = window.adsbygoogle || []).push({});

3. [HRW6 7.P.022.] A 220 g block is dropped onto a relaxed vertical spring that has a spring constant of k = 2.8 N/cm. The block becomes attached to the spring and compresses the spring 11 cm before momentarily stopping.

(c) What is the speed of the block just before it hits the spring? (Assume that friction is negligible.) [in meters/second]

(d) If the speed at impact is doubled, what is the maximum compression of the spring? [in meters]

I don't know how to begin (c)....and (d) I assumed it would be either 4 times bigger or 2 times bigger than 11 cm -- which is wrong.

(c) I started by using the equation....W = K-final - K-initial (W - work, K - kinetic energy) which is W = 0.5 * k * x-final ^ 2 ("k" is the spring constant). When I finished pluggin numbers in and solving I got the answer 0.86334 J yet this answer is wrong....what am I doing wrong?

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# Homework Help: Springs, Vectors, and a graph

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