Att = 0, force F (- 3.80i + 5.20j + 3.10k ) N begins to act on a 2.90 kg particle with an initial speed of 3.60 m/s. What is the particle's speed when its displacement from the initial point is d = (1.80î + 2.10f + 6.90k) m ?

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.