A block rests on a horizontal, frictionless table. It is attached to a spring an

Question

A block rests on a horizontal, frictionless table. It is attached to a spring and set into motion. The picture above shows snapshots of the block at 5 different labelled locations during the motion. The two extreme locations (Points A and E) represent the two extremes of the motion of the block. Point D represents the equilibrium position. Evaluate each statement below.
The kinetic energy of the block at location B is ____. (Positive, Zero, Negative)
The potential energy of the spring at location E is ____.(Positive, Zero, Negative)
The potential energy of the spring at location D is ____. (Positive, Zero, Negative)
The kinetic energy of the block at location A is ____. (Positive, Zero, Negative)
The kinetic energy of the block at location D is ____. (Positive, Zero, Negative)

Explanation / Answer

NOte:KE can never be negative as KE=0.5*m*(v squared)[mass is always positive and so is the squared term]

1)positive as block is stationary at only point A

2)zero as there is no compression or tension

3)zero at equilibrium there is no compression or tension

4)positive as the block has some velocity

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