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27-05-2020
Physics

contestada

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

Respuesta :

sahadahlawani sahadahlawani

27-05-2020

Answer:

A,about 15kg.

Explanation:

PE=KE

mgh=1/2mv^2

m(9.81)(30)=4392

294.3m=4392

m=14.9235474

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