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A box of mass m slides at an initial speed v into a relaxed spring of spring constant k.

How long is the box in contact with the spring before it passes the equilibrium position again?

A) tcontact = 2p [k/m]½

B) tcontact = p [m/k]½

C) tcontact = ½ p [m/k]½

p here represents pi.

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I believe the correct answer is A, because the box is with contact will the spring for a full oscillation. So 2pi.

Can somebody help me on this one, I seem to be really stuck. Thanks in advance!

(I posted a link to a picture of the system on the top.)