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Relative motion – Problem

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A driving instructor tells his student to maintain a 3 second separation between the students car and the car ahead.

English: At The King Street Roundabout Traffic...

Suppose the cars are traveling 25m/s. How many meters apart are the cars? If the trailing car brakes at 9m/s^2 how much distance is required to stop?

(Received via SMS from the Mobile site of askphysics )

Get more such problems here and here

Answer:

a) 75 m

b)

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