Question

A weighing bar with 75 kg mass is lifted to a height of 1.5 m by a weight lifter. What would be the potential energy of weight bars at highest position if lifter holds it for 5 seconds?

• A. 1102.5 J
• B. 3307.5 J
• C. 110.25 J
• D. 330.75 J

Answer 1

The correct option is A

1102.5 J

At a height, the weighing bar will have just the potential energy. Potential energy is independent of time.

Potential Energy = mgh = 75 x 9.8 x 1.5 = 1102.5 J