You sit on the swing, and your friend gives you a gentle push so that you swing

Question

You sit on the swing, and your friend gives you a gentle push so that you swing out over the creek. How long will it be until you swing back to where you started?
0.75
1.5
2.4
4.7


Part B
Now you switch places with your friend, who has twice your mass. You give your friend a gentle push so that he swings out over the creek. How long will it be until he swings back to where he started?
0.75
1.5
2.4
4.7


Part C
Your friend now pushes you over and over, so that you swing higher and higher. At some point you are swinging all the way across the creek-at the top point of your arc you are right above the opposite side. How fast are you moving when you get back to the lowest point of your arc?
6.3
9.5
4.2
10

Explanation / Answer

4.7 2.4 9.5

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