A 5.00 kg ball falls from a 2.00 m-high shelf.Just before hitting the floor,what will be its kinetic energy? (g = 9.80 m/s² and assume air resistance is negligible) A) 98.0 J B) 49.0 J C) 19.6 J D) 10.0 J

Question

Quizplus · Accepted Answer

The potential energy of the ball just before falling is given by:

PE = mgh

where m is the mass of the ball, g is the acceleration due to gravity, and h is the height of the shelf. Substituting the given values:

PE = (5.00 kg)(9.80 m/s^2)(2.00 m) = 98.0 J

When the ball hits the ground, all its potential energy is converted into kinetic energy. Therefore, the kinetic energy just before hitting the ground is also 98.0 J.

Hence, the best choice is A) 98.0 J.

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