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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?

Respuesta :

sqdancefan

Answer:

  1. 24.5 km/h
  2. 4 17/27 m/s
  3. 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

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