A speed-time graph has zero gradient when the body moves with:
A
Constant speed
B
Increasing acceleration
C
Decreasing distance
D
Free fall only
Correct Answer: Option A — Constant speed
Explanation:
A correct analysis gives Constant speed when magnitude, direction, units and conditions are considered. The question tests whether the learn...
A correct analysis gives Constant speed when magnitude, direction, units and conditions are considered. The question tests whether the learner can distinguish the required quantity from related ideas and use the stated information without adding unsupported assumptions. The alternatives Increasing acceleration, Decreasing distance, and Free fall only do not satisfy the governing definition, graph interpretation, direction convention, or numerical relationship in this case. In examinations, identify the known quantities, keep SI units consistent, select a positive direction where needed, and apply the appropriate definition or equation. This also checks that the answer has a sensible magnitude and unit.