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A simple pendulum and a mass hanging on a spring both have a period of 1 sec when set into oscillatory motion on Earth. They are taken to Planet X, which has the same diameter as Earth but twice the mass. Which is true about the periods of the two objects on Planet X compared to their periods on Earth?
a. Both are shorter. Both are the same.
b. The period of the spring is shorter;
c. the pendulum is the same.
d. The period of the pendulum is shorter;
e. the spring is the same
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