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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

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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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
User Sam Oliver
by
7.0k points

1 Answer

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

answered
User Buck Hicks
by
8.4k points
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