# Question: To pass a physical fitness test Marcella must run 1000

To pass a physical fitness test, Marcella must run 1000 m at an average speed of 4.00 m/s. She runs the first 500 m at an average of 4.20 m/s.

(a) How much time does she have to run the last 500 m?

(b) What should be her average speed over the last 500 m in order to finish with an overall average speed of 4.00 m/s?

(a) How much time does she have to run the last 500 m?

(b) What should be her average speed over the last 500 m in order to finish with an overall average speed of 4.00 m/s?

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