Rotational speed is the number of rotations or revolutions made per unit of time. True or false? Please help me this is timed?

A2 kg ball travellng to the right with a speed of 4 m/s collidees with a 5 kg ball traveling to the left with a speed of 3 m/s. take right to be the positive direction. what is the total momentum of the two balls before they collide? what is the total momentum of the two balls after they collide?

Many science fiction movies and tv shows have detected using a nuclear weapon to destroy astroids what problems does plait see with this plan

Kinetic energy depends a. mass b. speed (velocity) c. both of the above d. none of the above