Which expression is a measurement of density? 5.2 cm 3 0.71 mg 20 g/cm 2 5.13 kg/l?

We know that the density is defined as the ratio of mass to the volume.

Density = Mass/volume

We know that the unit of the mass is kg

Unit of the volume is liter (l)

Therefore the unit of the density will be kg/l .

Now the first expression is 5.2 Cm^3 which is a unit of volume. Therefore it will not be the expression for density.

Second expression is 0.71 mg which has unit of mass. Therefore it will also not be the expression for the density

Third expression is 20 g/cm^2 which also not have the unit of density.

Fourth expression is 5.13 kg/l which is having unit of density.

Therefore the expression of density will be 5.13 kg/l

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.