# Answer to Question #113 in Mechanics | Relativity for Lisa

Question #113

Two bodies of equal volume — made of steel and lead - move with identical velocities. Compare the impulses of these bodies.

Expert's answer

With equal speed, the momentum depends only on the masses. Under equal volumes, the density of lead is 11,35 g/cm3, the density of steel is 7,85 gr/cm3. The density of lead is higher, this means that body weight of the lead body is bigger, thus the impulse is also bigger.

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