A 500-N Box Is Sliding on a Rough Horizontal Floor, and and the Only

question 28

Multiple Choice

A 50.0-N box is sliding on a rough horizontal floor, and the only horizontal force acting on it is friction. You observe that at one instant the box is sliding to the right at 1.75 m/s and that it stops in 2.25 s with uniform acceleration. What magnitude force does friction exert on this box?

• A) 3.97 N
• B) 8.93 N
• C) 38.9 N
• D) 50.0 N
• E) 490 N

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Definitions:

Wilcoxon Rank-sum Test

A nonparametric test used to assess whether there is a significant difference between two independent samples based on median comparison.

Kruskal-Wallis Test

A nonparametric statistical test used to compare three or more groups or samples that do not meet the assumption of normality.

Left-tailed Wilcoxon Rank Sum Test

A nonparametric test used to assess whether one of two groups of independent samples tends to have lower values than the other.

Test Statistic

A calculated value from sample data used to test a hypothesis against a null hypothesis.