alleryA car decelerates uniformly from 30 m/s to 0 in 6 seconds. Its acceleration is:
A−5 m/s²
B+5 m/s²
C−30 m/s²
D+30 m/s²
Answer & Solution
Correct answer: A. −5 m/s²
We have a = (v − u) / t.
That is a = (0 − 30) / 6.
So a = −5 m/s².
Negative sign indicates deceleration (slowing down).
The car loses 5 m/s of speed every second.
Keep practising Motion
Browse all Motion questions for CBSE Class 9, or explore more Science topics.
Related questions
Match each circular motion property with its principle:Match each graph characteristic with the motion it represents:Match each motion scenario with the resulting displacement:Match each motion term with its SI unit and symbol:Pick the right answer, quicklyOrder a journey's measurementsSpot the one that does not fitSort each idea by what it describes