Multiple choice

An object covers a distance of 20 m with a speed of 40 m/s and covers another 30 m in 2 seconds. What is the average speed of the object?

  1. 20 m/s

  2. 10 m/s

  3. 35 m/s

  4. 12.5 m/s
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A Correct answer
Explanation

Average speed = Total distance / Total time. Total distance = 20 + 30 = 50 m. Time 1 = 20/40 = 0.5 s. Time 2 = 2 s. Total time = 2.5 s. Average speed = 50 / 2.5 = 20 m/s.

AI explanation

Using the formula for average speed as total distance divided by total time, the first time taken is 20 m divided by 40 m/s, which is 0.5 seconds. The total distance is 20 m plus 30 m, giving 50 m, and the total time is 0.5 s plus 2 s, giving 2.5 s. Dividing 50 m by 2.5 s gives an average speed of 20 m/s.

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