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:

▸

The period is about 0.7 times as large as before

▸

The period is unaffected

▸

The period is twice as large as before

▸

The period is half as large as before

▸

The period is about 1.4 times as large as before