1 - A train travels 92 kilometers in 3 hours, and then 55 kilometers in 3 hours. What is its average speed?

2 - What is the speed of a bobsled whose distance-time graph indicates that it traveled 125m in 27s?

3 - Suppose you increase your walking speed from 4 m/s to 15 m/s in a period of 3 s. What is your acceleration?

Question

Orr

Physics

24 November, 10:46

1 - A train travels 92 kilometers in 3 hours, and then 55 kilometers in 3 hours. What is its average speed?

2 - What is the speed of a bobsled whose distance-time graph indicates that it traveled 125m in 27s?

3 - Suppose you increase your walking speed from 4 m/s to 15 m/s in a period of 3 s. What is your acceleration?

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Answers (1)

Know the Answer?

Sydney Simon · Answer 1

Answer: 24.5 km/h 4 17/27 m/s 11/3 m/s² Explanation:

1. The average speed is the ratio of total distance to total time:

... speed = distance/time = (92 km + 55 km) / (3 h + 3h) = (147 km) / (6 h)

... = 24.5 km/h

2. speed = distance/time = (125 m) / (27 s) = 4 17/27 m/s

3. a = ∆v/∆t = (15 m/s - 4 m/s) / (3 s) = 11/3 m/s²