In order for fusion to begin during the birth of a star, there needs to be a certain amount of a. mass. b. charge. c. density. d. volume.

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.

so easy. just google the electromagnetic waves and it’ll pop up.