1. (5
points)
Particle I is at position
r
1
at time
t=0
and it moves with a constant velocity
v
1
. Similarly, particle 2 is at position
r
2
at time
t=0
and moves with a constant velocity
v
2
. None of the vectors are equal. State a condition for which the particles will collide.
2. (5
points)
True or False: The frictional force acting on an object always has a direction
opposite to the object's velocity. Explain.

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