Two cars collide with each other. Before the collision, one car (m= 1100 kg) is going north at 18 m/s and the other car (m= 1300 kg) is going south at 16
m/s. What is the momentum of the system made up of the two cars after the
collision?

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true

prolly a beacuse the momentuem the car has increases while going down hill

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form