A Rock Is Thrown from the Upper Edge of a Tall

question 48

Multiple Choice

A rock is thrown from the upper edge of a tall cliff at some angle above the horizontal.It reaches its highest point and starts falling down.Which of the following statements about the rock's motion are true just before it hits the ground? (There could be more than one correct choice. )

• A)Its horizontal velocity component is zero.
• B)Its velocity is vertical.
• C)Its vertical velocity component is the same as it was just as it was launched.
• D)Its horizontal velocity component is the same as it was just as it was launched.
• E)Its speed is the same as it was just as it was launched.

---

Definitions:

Stanford Achievement Test

A standardized test that measures academic knowledge and skills in young students, covering a variety of subjects.

Army Alpha

A historic written test developed by the United States Army during World War I to assess the intelligence and aptitude of military recruits.

Mental Test

An examination designed to measure cognitive abilities, intelligence, or specific mental functions.

Psychological Laboratories

Facilities equipped for experimental and research purposes in the field of psychology.