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Various graphs of a simple pendulum and vertical oscillating object

As the reference height is at B, so above that reference height is considered positive, and below the reference height it is considered negative. Hence the height-time graph is as such.

Various graphs of a simple pendulum https://youtu.be/AJGNn6ni3aM

Consider a vertical oscillating object, similar to the simple pendulum, the middle is the fastest.

2016 PPP1Q3 Initial acceleration and terminal velocity of heavier object

Answer: Option C

View the video for explanation

2016 PPP1Q3 Initial acceleration and terminal velocity of heavier object https://youtu.be/MGAMBfDnohU