A 1.0-kg object moving in a certain direction has a kinetic energy of 2.0 J. It hits a wall and comes back with half its original speed. What is the kinetic energy of this object at this point?

Lets calculate the initial speed of the block. We know that kinetic energy is given by:

Solving for v₀:

If the speed after it hits a wall is half its original speed then:

v = v₀/2 = 2 m/s / 2 = 1 m/s

Then the kinetic energy at this point is:

The inetic energy of this object at this point is 0.5 J.

c.the charges if the proton and electron and gravity