The Vector $\overrightarrow { \mathbf { r } }$ Indicates the Instantaneous Displacement of a Projectile from the Origin

question 30

Multiple Choice

The vector $\overrightarrow { \mathbf { r } }$ indicates the instantaneous displacement of a projectile from the origin.At the instant when the projectile is at $\overrightarrow { \mathbf { r } }$ ,its velocity and acceleration vectors are $\overrightarrow { \mathbf { v } }$ and $\overrightarrow { \mathbf { a } }$ .Which statement is correct?

• A) \(\overrightarrow { \mathbf { v } }\) is always perpendicular to \(\overrightarrow { \mathbf { r } }\) .
• B) \(\overrightarrow { \mathbf { a } }\) is always perpendicular to \(\overrightarrow { \mathbf { r } }\) .
• C) \(\overrightarrow { \mathbf { a } }\) is always perpendicular to \(\overrightarrow { \mathbf { v } }\) .
• D) \(\overrightarrow { \mathbf { a } }\) is always perpendicular to \(\overrightarrow { \mathbf { v } } _ { x }\) .
• E) \(\overrightarrow { \mathbf { a } }\) is always perpendicular to \(\overrightarrow { \mathbf { v } } _ { y }\) .

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