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15 August, 21:03

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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Answers (2)
  1. 15 August, 21:41
    0
    A

    Explanation

    Simple
  2. 15 August, 22:18
    0
    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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