A Ball Rolls Up a Slope

question 84

Multiple Choice

A ball rolls up a slope.At the end of three seconds its velocity is 20 cm/s; at the end of eight seconds its velocity is 0 cm/s.What is the magnitude of its average acceleration from the third to the eighth second?

• A)2.5 cm/s²
• B)4.0 cm/s²
• C)5.0 cm/s²
• D)6.0 cm/s²
• E)6.67 cm/s²

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Definitions:

Hermann Ebbinghaus

A German psychologist best known for his pioneering work on the study of memory, including the forgetting curve and the spacing effect.

Ebbinghaus' Retention Curve

A graphical representation of the decline in memory retention over time, illustrating that memories diminish if not rehearsed.

Chunking

A strategy for making more efficient use of short-term memory by grouping information into larger units.

Relearning

The process of learning material or skills for a second time, often more quickly than the first, indicating the retention of latent knowledge.