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Motion — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceMotion1 Mark
MCQ
If north is the positive direction, which situation involves positive velocity and negative acceleration:
  • A
    A car speeding up as it moves southward
  • B
    A car moving southward at a constant speed
  • ✓
    A car slowing down as it moves northward
  • D
    A car slowing down as it moves southward
✓

Answer

Correct option: C.
A car slowing down as it moves northward
The rate of change of velocity with respect to time is known as acceleration.
Negative acceleration means a decrease in velocity with respect to time.
If a car is moving northward and slowing down, the displacement will be along the north $($positive$),$ so the velocity will be positive until it gets stopped.
As the car is slowing down, the acceleration will be negative.

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