A ball of clay with a mass of 55 g and a speed of 1.5 m/s collides with a 55 g ball of clay that is at rest. By what percent has the kinetic energy decreased after the inelastic collision?

The kinetic energy decreased 50 % after the inelastic collision.

Explanation:

Since both ball collide and experiments an inelastic collision, the final velocity of the system is found by means of the Principle of Linear Momentum:

(1)

Where:

, - Masses of the balls of clay, measured in kilograms.

, - Speeds of the balls of clay before collision, measured in meters per second.

- Speed of the system after collision, measured in meters per second.

If we know that , and , then the speed of the system after collision is:

The initial () and final kinetic energies of the system (), measured in joules, are now described by the following equations:

(2)

(3)

And the percentage of lost energy due to inelastic collision is:

(4)

If we know that , , and , then the percentage of lost energy due to inelastic collision is:

The kinetic energy decreased 50 % after the inelastic collision.

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.

close lines strong magnet less close weaker