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GK QUESTION#2999

Which option correctly explains how velocity and acceleration relate in motion along a single straight path?

  1. AThey always act at right angles to one another in linear motion.
  2. BIn planar motion, acceleration must always oppose the direction of travel.
  3. CIn straight-line motion, both quantities act along the same axis, either together or in opposite directions.Correct answer
  4. DIn spatial motion, both must necessarily point in the same direction.
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Answer

C. In straight-line motion, both quantities act along the same axis, either together or in opposite directions.

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Explanation

For motion constrained to one straight line, velocity and acceleration have components only along that line. When both are nonzero, the same direction means increasing speed and opposite directions mean decreasing speed. Acceleration can also be zero.

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