Which of the following choices has the type of wave matched with a correct characteristic of that wave electromagnetic waves are always longitudinal mechanical waves are always a transverse electromagnetic waves always require a medium to travel mechanical waves always require a medium to travel

D.Mechanical waves always require a medium to travel.

Explanation:

Longitudinal waves: It is that type of waves in which waves  require a medium to travel.Longitudinal waves can be modeled by spring. Example: mechanical waves.

Transverse waves:It is that type of waves which may or may not require medium to travel depending upon the type of wave.Example:EM and ocean waves.

A.It is false because EM waves are always transverse waves.

B.It is false because mechanical waves are always longitudinal waves.

C.It is false because EM waves  always do not    require  a medium to travel.

D.It is true because mechanical waves are longitudinal waves which require a medium to travel.

D.Mechanical waves always require a medium to travel.

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.

answerdmitry mendeleyev made a workable classification of the elements