A Track Star in the Broad Jump Goes into the Jump

question 8

Multiple Choice

A track star in the broad jump goes into the jump at 10 m/s and launches himself at 20 $\degree$ above the horizontal. How long is he in the air before returning to Earth? Note: g = 9.8 m/s².

• A) 0.35 s
• B) 0.42 s
• C) 0.70 s
• D) 0.89 s

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Definitions:

Null Hypothesis

A statement or assumption that there is no significant difference or effect, serving as the default conclusion until evidence suggests otherwise.

Critical Value

A threshold in statistical hypothesis testing that defines the boundary or limit beyond which an observed test statistic is considered statistically significant.

Perfect Adjustment

An ideal state in statistical models where the predicted values and actual values align perfectly, indicating no prediction error.

Test Statistic

A numerical value determined from a sample data that is used in testing a hypothesis about a population parameter.