(Answered) A train travels 75 kilometers in 4 hours and then 60

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A train travels 75 kilometers in 4 hours, and then 60 kilometers in 1 hours. What is its average speed?

A ball is rolled uphill a distance of 3 meters before it slows, stops, and begins to roll back. The ball rolls downhill 29 meters before coming to rest against a tree. What is the magnitude of the ball's displacement? m

What is the speed of a bobsled whose distance-time graph indicates that it traveled 106m in 25s? m/s

An object moving at 31m/s takes 5s to come to a stop. What is the object's acceleration? m/s2

Suppose you increase your walking speed from 5 m/s to 12 m/s in a period of 1 s. What is your acceleration? m/s2

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