I'm reviewing for a test on everything I learned last year and I'm having trouble with these two questions:(adsbygoogle = window.adsbygoogle || []).push({});

1. A rock is dropped from a sea cliff and the sound is heard 3.4s later. Speed of sound is 340 m/s, how high is the cliff?

2. A motorist passes a cop at 120 km/h. The cop begins immediately accelerating at 10 km/h/s. How much time will it take to catch the speeder and how fast will the officer be travelling?

I can't get my equations right so I have to many unknowns... the sad thing is I've seen both of these questions before... :\

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# Homework Help: Speed of sound is 340 m/s

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