25-02-2019
Physics

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A rock is dropped and falls freely at 100 meters to Earth. What is the speed of the object after 4 seconds?

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25-02-2019

Gravity adds 9.8 m/s to the speed of the falling rock every second. If there's enough height for it to keep dropping for 4 seconds, then gravity does that 4 times, and its speed grows to 4 times (9.8 m/s) which is . . .

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