A rock falls 30 m. Its KE before it strikes the ground is 4,392 J. What is the mass of the rock? A. 15 kg B. 146 kg C. 1.5 kg D. 3.0 kg

asked Oct 19, 2021 186k views

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A rock falls 30 m. Its KE before it strikes the ground is 4,392 J. What is the

mass of the rock?
A. 15 kg
B. 146 kg
C. 1.5 kg
D. 3.0 kg

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3 votes

Answer:

A,about 15kg.

Step-by-step explanation:

PE=KE

mgh=1/2mv^2

m(9.81)(30)=4392

294.3m=4392

m=14.9235474

Buck Hicks answered Oct 25, 2021

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