renny22002
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HELP NEEDED! Determine the mechanical energy of this object: a 1-kg ball rolls on the ground at 2 m/s.

A. The ball is on the ground, so the mechanical energy is zero.
B. 2 J
C. 1 J
D. 4 J

Respuesta :

Genius102
I think it's 2 J. Hope I helped :)
scme1702
The mechanical energy of an object is the sum of its potential and kinetic energy.

Because the ball is on the ground, its potential energy is 0.
Its kinetic energy is given by:

K.E = 1/2 mv²
K.E = 1/2 x 1 x 2²
K.E = 2 J

Mechanical energy = 2 + 0
Mechanical energy = 2 J

The answer is B.

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