Which of the following methods can be used to increase the average kinetic energy of the molecules of an object?

a. increase the size of the molecules.
b. slow down the speed of the molecules.
c. decrease the amount of heat supplied.
d. increase the temperature of the object.

Can someone me with questions 12 and 13 plz.

Plz mark brainliest 30 points1) find the momentum of a 12 kg snowball that is rolling with a velocity of 9 m/s.2) an 8 ball with a mass of .5 kg is sitting at rest. it is hit by the cue ball (1 kg) traveling at 2.5 m/s. if the cue ball is at rest after the collision, how fast is the 8 ball traveling after the collision? 3) two football players are running toward each other. if the offensive player is 75 kg and is running 8 m/s, how fast must the 60 kg defensive player run in order for the two players to hit and stop?

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?