Question

A stone of mass 2 kg is thrown up with a velocity 10 m/s. Its potential energy at the (X) maximum height is:

• A. 200J
• B. 100J
• C. 50J
• D. 400J

Answer 1

Answer:

B. 100J

• According to the law of conservation of energy, the potential energy at the maximum height equals the initial kinetic energy given to the stone at the ground level, because all kinetic energy transforms completely into potential energy at the highest point.

• KE=1/2MV²=1/2 x 2 x(10m/s)²=1 x 100=100J