11: Block A, with a mass 30 kg, rests on the incline. The oefficient of static friction between the incline and block A is 4. The largest mass of the block B (in kg) for which A emains at rest is: ) 2.5 b) 9.0 c) 5.9 d) 27 35° B

Q: PA P+ A B B (a) (b)

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!