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Your friend is on rollerblades holding a pendulum. You gently push her forward and let go. You observe that the pendulum first swings in the opposite direction (backward) and then returns to the vertical orientation as she coasts forward.
Part A
Choose the correct force diagram of the pendulum bob (in inertial reference flame) as your friend is being pushed. y-direction is the vertical direction.

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ifyoudontswimyousink
It would be using Newton's First Law. Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. It may be seen as a statement about inertia, that objects will remain in their state of motion unless a force acts to change the motion.

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