Question

Determine the mechanical energy of this object:

a 1-kg ball rolls on the ground at 2m/s

Answer 1

Mechanical energy = potential energy + kinetic energy
The ball is on the ground so has no potential energy.

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