What two factors will most likely change the speed of a mechanical wave?
amplitude and wavelength
frequency and amplitude
period and wavelength
period and amplitude

frequency and amplitude

C. Period and wavelength

Explanation:

Because this makes so much sense, hope it helps

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.