A car traveling at a constant speed of 20 m/s accelerates uniformly at 2.5 m/s^2 over a straight distance of 100 m. What is the final velocity of the car at the end of this distance?
Answer and explanation
Correct answer: C. 30 m/s
- Step 1: Use the kinematic equation . Step 2. Substitute: . Step 3. m/s. Answer: 30 m/s. Why not the others: '25 m/s' forgets that must be added to ; '35 m/s' adds the speed gain linearly; '28 m/s' comes from using the wrong distance.
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