A Stone Is Thrown with an Initial Speed of 15

question 9

Multiple Choice

A stone is thrown with an initial speed of 15 m/s at an angle of 53° above the horizontal from the top of a 40-m building.If g = 9.8 m/s² and air resistance is negligible,then what is the magnitude of the horizontal component of velocity as the rock strikes the ground?

• A) 7.5 m/s
• B) 9.0 m/s
• C) 12 m/s
• D) 29 m/s

---

Definitions:

Control Group

In an experiment, the group of subjects not exposed to the treatment or intervention, used as a benchmark to measure the effect of the treatment.

Correlation

Correlation is a statistical measure that indicates the extent to which two or more variables fluctuate together.

Observational Studies

Research methods where the investigator observes subjects without manipulation, aiming to find correlations between variables.

Planetary Motion

The movement of planets around a star, such as the orbit of Earth and other planets around the Sun.