Question

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​

Answer 1

Answer: Option B) 1038J

Step-by-step 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