7. A rocket is moving at a constant acceleration of 9.8 m/s2 far away from any astronomical object. A marble is fired ?horizontally? inside the rocket at a speed of 20 m/s .According to an observer inside the rocket,
A. the marble will have no vertical velocity.
B. the marble will have a horizontal velocity of 20 m/s and a vertical velocity of 9.8t m/s in t second after firing.
C. the marble will have a horizontal velocity of 20 m/s and a vertical velocity of -9.8t m/s in t second after firing.
D. the marble will have a velocity of (20 + 9.8t) m/s in t second after firing.
Moderation Team
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