A mass M is attached to spring, which exerts no force at position C. The spring is compressed until the mass is in position A. Then the mass is released. At what position is the velocity at a maximum and positive? At what position is the acceleration at a maximum and positive?

Maximum velocity: Position C, Maximum positive acceleration: Position A.

Explanation:

Let consider that spring is compressed in the negative direction. Then, the maximum velocity occurs at position C, when spring is not compressed nor stretched. Since force in spring is of reactive nature, that is, the direction of force is opposed to the direction of movement, a maximum positive acceleration occurs at position A.

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