A mass that can oscillate without friction on a horizontal surface is attached to a horizontal spring that is pulled to the right 10.0 cm and is released from rest. The period of oscillation for the mass is 5.60 s. What is the speed of the mass at t = 2.50 s?
a) −2.61 · 10−1m/s
b) −3.71 · 10−2m/s
c) −3.71 · 10−1m/s
d) −2.01 · 10−1m/s
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