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Motion — Science STD 9 — Question

Rajasthan BoardEnglish MediumSTD 9ScienceMotion1 Mark
Question
Which of the following vehicles is undergoing a deacceleration?
✓

Answer

  1. A van slowing down as it approaches a stop sign
Explanation:
A object is said to have an acceleration if it changes its velocity either by increasing its speed, decreasing its speed or changing the direction of its velocity.
Since the car and the truck move with constant speed, thus they have zero acceleration.
But the van is slowing down its speed, thus it has deacceleration.

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