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| The boulder, unfortunately has more momentum than the runner |
Momentum is the
mass of an object multiplied by its velocity. The momentum of an object depends
on its mass and velocity. This means that an object's momentum changes as it accelerates.
Momentum can be transferred between objects. When a moving ball collides with a
stationary one, for example, the first ball transfers some of its momentum to
the second ball. The total momentum of the two balls is the same as the first
ball's momentum before the collision. This is called the principle of conservation
of momentum.
(Dictionary of Science, by Neil Ardley)