A Tennis Ball Is Thrown Vertically with an Initial Speed

question 31

Multiple Choice

A tennis ball is thrown vertically with an initial speed of 20.0 m/s at time t = 0 s. Approximately, what is the initial speed of the ball relative to an observer in a car that moves horizontally past the launch location with a constant speed of 30 m/s?

• A)10 m/s
• B)20 m/s
• C)30 m/s
• D)36 m/s
• E)50 m/s

---

Definitions:

Stable/Unstable

Pertains to the degree of constancy or variability in a system's state; stable implies little or no change, whereas unstable indicates high likelihood of change.

Global/Specific

This term contrasts between broad, overarching concepts (global) and distinct, precise elements (specific).

External Attributions

The process of attributing the cause of one's own or others' behavior to external factors, circumstances, or situations outside one's control.

Control

The ability to sway or guide the actions of individuals or the direction of happenings.