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'You are playing paintball with a friend who is standing 15 meters away from you. You shoot at her and miss. The paintball has a horizontal velocity of 150 meters per second. Which of the following sequences describes the distances of the ball from you, in meters, at one-tenth second intervals, starting when it swooshes by her?
A. 15, 30, 45, 60, 75, ...
B. 15, 165, 315, 465, 615, ...
C. 15, 25, 35, 45, 55, ...
D. 30, 45, 60, 75, 90, ...
E. 150, 300, 450, 600, 750, ...'

Sagot :

AL2006idn
At 150 meters per second, the ball covers 15 meters every 1/10 of a second.
When it swooshes by her, it's 15 meters from you.  Beginning at that time, the
distances from you at subsequent intervals of 1/10 second are 30, 45, 60, 75, etc.
That's choice-'D'.

Note that only the horizontal distance from you is reflected.  The drop of the paintball
under the influence of gravity is utterly and completely ignored.
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