Constant Acceleration: a Car Is 200 M from a Stop

question 30

Multiple Choice

Constant acceleration: A car is 200 m from a stop sign and traveling toward the sign at 40.0 m/s. At this time, the driver suddenly realizes that she must stop the car. If it takes 0.200 s for the driver to apply the brakes, what must be the magnitude of the constant acceleration of the car after the brakes are applied so that the car will come to rest at the stop sign?

• A) 2.89 m/s²
• B) 3.89 m/s²
• C) 4.17 m/s²
• D) 3.42 m/s²
• E) 2.08 m/s²

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Definitions:

Percentile Score

A statistical value indicating the relative standing of a score within a group, showing what percentage of the group's distribution falls below it.

Confounding Variable

An external variable that influences both the dependent and independent variables in an experiment, potentially skewing the results.

Independent Variable

In experimental research, the variable that is manipulated or changed to observe its effects on the dependent variable.

Dependent Variable

The outcome the researcher is interested in measuring.