4. A rock is dropped off a cliff that's 80m high. If it strikes the ground with an impact velocity of 40m/s,what acceleration did it experience during its descent?
a. 10m/s
b. 20m/s
c 30m/s
d. 25m/s
e.NOT
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Explanation:
20 m/s²
this is your answer
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Answer:
20m/s2
Explanation:
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