How does it feel when you walk after doing a wall sit?

Ametal ball with a mass of 0.028 kg is dropped from rest at a height of 1.0 meters above the ground. assuming the energy in the ball is conserved, how much kinetic energy will the ball have when it is 0.5 meters above the ground?

In the first law of thermodynamics, triangle e=q-w, what does q stand for

What causes the formation of ocean currents?