AS Daily A Level Physics question
A trolley moves in a straight line from mark O to mark P, a displacement of 6.0 m. On a second run it travels from O to P in half the time, along the same straight line and in the same direction. Which statement must be true for the average velocity on the second run compared with the first?
Answer
The correct answer is C.
Correct: C — Its magnitude doubles and its direction is the same. A the time is halved for the same displacement, so the magnitude should double, not halve. B the direction does not reverse because the displacement is along the same straight line in the same sense. C halving the time for the same displacement makes the magnitude twice as large, and the direction is unchanged. D a 50% increase (1.5×) is too small; the correct change is 2×.