The vector 
indicates the instantaneous displacement of a projectile from the origin. At the instant when the projectile is at 
, its velocity and acceleration vectors are ![]()
data-wiris-created="true" src="https://sciemce.com/media/2/ppg__cognero__Chapter_4_Two_and_Three_Dimensional_Motion.__media__371fb4f7-4cfb-4a5f-ad2f-37675ea769ec.PNG" style="vertical-align:middle;" /> and 
. Which statement is correct?
A.
is always perpendicular to .B.
is always perpendicular to .C.
is always perpendicular to .D.
is always perpendicular to 
.E.
is always perpendicular to 
.Answer: D
You might also like to view...
At what speed relative to the lab will a 0.272-kg object have the same momentum as a 1.30-kg object that is moving at 0.515c relative to the lab?
A) 0.944c B) 0.592c C) 0.981c D) 0.922c
A critical difference between millisecond and normal pulsars is that:
A) the millisecond ones are not associated with the galaxy, but scattered everywhere. B) the millisecond ones are speeding up, but normal pulsars slow down over time. C) the millisecond ones must eventually collapse into black holes. D) the millisecond ones all have planets, while normal ones do not. E) millisecond ones are only found in globular clusters, while normal ones are not.
If a monkey floating in outer space throws his hat away, the hat and the monkey will both
A) move away from each other, but at different speeds. B) move away from each other at the same speed. C) move a short distance and then slow down. D) move a short distance and then go faster. E) come to a stop after a few minutes.
The figure below shows the unusual path of a confused football player. After receiving a kickoff at his own goal, he runs downfield to within inches of a touchdown, then reverses direction and races back until he’s tackled at the exact location where he first caught the ball. During this run, which took 25 s, what is his displacement?