A 8.00-kg bowling ball falls from a 3.50-m shelf.Just before hitting the floor,what will be its kinetic energy? (g = 9.80 m/s² and assume air resistance is negligible) A)280 J B)49.0 J C)2.86 J D)274 J E)28.0 J

Question

Quizplus · Accepted Answer

Potential energy before falling can be calculated using the formula:
PE = mgh = 8.00 kg x 9.80 m/s^2 x 3.50 m = 274.4 J

At the moment just before hitting the floor, all of this potential energy is converted to kinetic energy:
KE = 274.4 J

Therefore, the correct answer is D) 274 J

A 800-Kg Bowling Ball Falls from a 3