Which one describes how much matter in object contains using SI units

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)

Which component of the earth’s atmosphere is decreased due to photosynthesis?

Mixing salt in water is an example of physical change