Adisc of mass m slides with negligible friction along a flat surface with a velocity v. the disc strikes a wall head-on and bounces back in the opposite direction with a kinetic energy one fourth of its initial kinetic energy. what is the final velocity of the disc? group of answer choices -v/2 -v/4 v/4 v/2 -v

-v/2

Explanation:

Given that:

We know, kinetic energy is given as:

consider this to be the initial kinetic energy of the body.

Now after collision:

Considering that the mass of the body remains constant before and after collision.

Therefore the velocity of the body after collision will become half of the initial velocity but its direction is also reversed which can be denoted by a negative sign.

because if the tool that you are using is not balanced it there would be false mass.