An Object Starts from Rest and Moves with an Acceleration

question 24

Multiple Choice

An object starts from rest and moves with an acceleration of 2.0 m/s² for 3.0 seconds.It then reduces its acceleration to 1.0 m/s² for 5.0 additional seconds.The velocity 8 seconds from the start of the motion is

• A) 51 m/s.
• B) 38 m/s.
• C) 11 m/s.
• D) 9.0 m/s.
• E) 7.6 m/s.

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Definitions:

F-distribution

A probability distribution that arises in the testing of whether two population variances are equal.

Testing

The process of using statistical methods to determine if there is enough evidence to reject a given hypothesis about a data set.

Z-test

A statistical test used to determine whether there is a significant difference between the mean of a sample and the mean of a population, or between the means of two samples, assuming a normal distribution.

T-test

A statistical test used to compare the means of two groups or samples to see if they are significantly different from each other.