Example 1 · Kinematics
An object starts from rest and accelerates in a straight line at a constant 2.0 m/s² for 5.0 s. What distance does it travel during this interval?
- A.5 m
- B.10 m
- C.20 m
- D.25 m
- E.50 m
Show answer and worked explanation
Answer D: 25 m
With initial speed u = 0 and constant acceleration, s = ut + ½at² = ½ × 2.0 × 5.0².
The distance is 25 m. Alternatively, the final speed is 10 m/s and the average speed over the interval is 5 m/s, giving 5 × 5 = 25 m.
