A Particle Decelerates Uniformly from a Speed of 30 Cm/s

question 54

Multiple Choice

A particle decelerates uniformly from a speed of 30 cm/s to rest in a time interval of 5.0 s.It then has a uniform acceleration of 10 cm/s² for another 5.0 s.The particle moves in the same direction along a straight line.The average speed over the whole time interval is

• A)20 cm/s
• B)35 cm/s
• C)38 cm/s
• D)100 cm/s
• E)12 cm/s

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Definitions:

Decay Theory

A theory of forgetting that proposes that memories may fade or erode over time in the absence of rehearsal or usage.

Sensory Memory

The very first system in memory, in which raw information from the senses is held for a very brief period of time.

Short-Term Memory

The capacity for holding a small amount of information in mind in an active, readily available state for a short period of time.

Prefrontal Cortex

A region of the brain located at the front of the frontal lobes, associated with complex behaviors, decision making, and moderating social behavior.