A Vertical Spring System with a Bob Having Mass M

Multiple Choice

A vertical spring system with a bob having mass M is set into motion with amplitude A. When the bob replaced by one having mass 2M, the following can be concluded:

A) The period is about 0.7 times as large as before
B) The period is unaffected
C) The period is twice as large as before
D) The period is half as large as before
E) The period is about 1.4 times as large as before