Try to answer this exercises in a separate sheet of paper. SHOW YOUR SOLUTION.

1. A 25-kg object is located 8 m above the ground level. Find it's potential energy.
2. A 0.15 kg ball.is thrown upward. If the gravitational potential energy of the ball on its highest position is 1.80)
relative to its initial point, what height did the ball reach?
3. An object is placed at a height of 400 m from the ground. Using the ground as reference point, what is the mass
of this object if it has a potential energy of 30 kJ?​​​