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4.) An unmarked police car, traveling a constant 95 h , is passed by a speeder...

4.) An unmarked police car, traveling a constant 95 h , is passed by a speeder traveling 145 h .
Precisely 1.00 s after the speeder passes, the policeman steps on the accelerator. If the police car’s acceleration is 2.00 fracms2, how much time elapses after the police car is passed until it overtakes the speeder (assumed moving at constant speed)?
answer: 15.8 seconds

5.) Assume in Problem 4 that the speeder’s speed is not known. If the police car accelerates uniformly as given above, and overtakes the speeder after 7.00 s, what was the speeder’s speed?

I just need help with number 5 :)
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