# Which has more momentum, a #"3 kg"# object moving at #"2 m/s"# or a #"5 kg"# object moving at #"9 m/s"#?

##### 1 Answer

Dec 18, 2015

Well, this is just evaluating your ability to remember the momentum equation:

#p = mv#

where#p# is momentum,#m# is mass in#"kg"# , and#v# is velocity in#"m/s"# .

So, plug and chug.

#p_1 = m_1v_1 = (3)(2) = "6 kg"*"m/s"#

#p_2 = m_2v_2 = (5)(9) = "45 kg"*"m/s"#

*CHALLENGE: What if these two objects were cars with well-lubricated wheels on a frictionless surface, and they collided head-on in a perfectly elastic collision? Which one would move in which direction?*