A Sphere Is Dropped from a Great Height and When

question 1

Multiple Choice

A sphere is dropped from a great height and when its speed reaches 20 m/s,its acceleration downward is 8.4 m/s².If the drag force is proportional to the square of the speed,what will be its acceleration downward when its speed reached 40 m/s?

• A) 2.6 m/s²
• B) 4.2 m/s²
• C) 8.0 m/s²
• D) 0 m/s² because it has now reached terminal velocity.

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Definitions:

Wilcoxon Signed Rank Test

A statistical test without assumption of underlying data distribution, designed to evaluate differences in the mean ranks of two paired samples, matched observations, or repeated measures within the same sample to determine variations in their population means.

Normal Approximation

A method used to approximate the distribution of a sum of independent random variables using the normal distribution, under certain conditions.

Continuity Correction

An adjustment made when approximating a discrete distribution with a continuous one, particularly relevant when making inferences about binomial distribution using normal approximation.

Null Hypothesis

A statement in statistics that suggests there is no significant difference or relationship between specified populations, any observed difference being due to sampling or experimental error.