What can you put on metal letters to protect them from acid rain?

Suppose a soccer ball is kicked from the ground at an angle 20.0º above the horizontal at 8.00 m/s. the y-velocity is determined to be 2.74 m/s. how long will the ball be in the air? assume the ball lands at the same height at which it was kicked.

What ia the energy of an object because of its potential and kinetic energies

If you let go of the notebook after lifting it, will it move? how?