NEED PHYSICS EXPERT, NO ONE IS HELPING ME What is the potential energy of an oscillator when it's at A/2?

I've been having trouble with this question, and I can't even find the answer on the internet.

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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a and b sometimes have a positive value

where is the photo and the answer choices?

b. false

explanation:

suppose a rock in free fall is dropped off a cliff. after falling for 5 seconds, its speed would not be 100 m/s.