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1. (5 points) Particle I is at position r1at time t=0 and it moves with a constant velocity v1. Similarly, particle 2 is at position r2at time t=0 and moves with a constant velocity v2. 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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