An 80-Kg Man Is Skating Northward and Happens to Suddenly $60 ^ { \circ }$

question 84

Short Answer

An 80-kg man is skating northward and happens to suddenly collide with a 20-kg boy who is ice skating toward the east. Immediately after the collision, the man and boy are seen to be moving together at 2.5 m/s in a direction $60 ^ { \circ }$ north of east. How fast was the boy moving just before the collision?

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Definitions:

Experimental Variable

The aspect of an experiment that is intentionally changed or manipulated to observe its effects on the outcome, also known as the independent variable.

Placebo

A substance or treatment with no therapeutic effect, often used in the control group of experiments to test the efficacy of treatments.

Field Experiment

An experimental research study conducted in a real-world setting where the researcher manipulates one or more variables to determine their effect.

Experiment

A scientific procedure undertaken to make a discovery, test a hypothesis, or demonstrate a known fact, involving the manipulation of variables under controlled conditions.