A boy is on a train that has a speed of 50mph relative to the ground. He has bal

Question

A boy is on a train that has a speed of 50mph relative to the ground. He has ball that he throws at 20mph relative to the train in the same direction the train is moving:

a) Relative to an observer on the ground, how fast is the ball moving?
b) If there is an observer on an other train, moving at 50mph in the same direction as the boy's train, how fast does this observer see the ball moving?
c) If the boy faces the front of the tray and blows a trumpet ( the speed of sound in still air is 600mph), what speed will the ground observer measure for the sound waves of the trumpet?
d) If there is an observer on the boy's train and he is standing in front of the boy, what will that observer measure for the speed of trumpet waves?

Explanation / Answer

a) 50 + 20 = 70mph b) 20mph c)650 mph d) 600mph

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