An object with an initial speed of 2 m/s accelerates uniformly at 4 m/s^2 for 5 s. What is its final speed?
Answer and explanation
Correct answer: D. 22 m/s
- Step 1: v = u + at. Step 2. v = 2 + 4 x 5 = 22 m/s. Answer: 22 m/s. Why not the others: 102 m/s: this squares the time. 20 m/s: this ignores the initial speed. 2.8 m/s: this divides acceleration by time.
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