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10 July, 13:41

A person of 83 kg is in an elevator. If the elevator is moving at

a speed of 5 m/s, what's the person's kinetic energy? Keep 4

significant figures

a 1,004 J

b 1,038

c 1,280 J

d 980 J

e

1,435 J

+4
Answers (1)
  1. 10 July, 14:26
    0
    Answer: Option B) 1038J

    Explanation:

    Given that

    Mass of person (m) = 83kg

    kinetic energy (KE) = ?

    Speed of elevator (v) = 5m/s

    Kinetic energy is the energy possessed by a moving object. It is measured in joules, and depends on the mass (m) of the object and the speed (v) by which it moves

    i. e K. E = 1/2mv²

    KE = 1/2 x 83kg x (5m/s) ²

    KE = 0.5 x 83 x 25

    KE = 1037.5J (Round the kinetic energy to the nearest whole number as 1038J)

    Thus, the kinetic energy of the person is 1038 Joules
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