2. A child wants to push 10-kg block of ice across a frozen lake as shown below. For ice sliding on ice, the coefficient of friction of static friction μµ = 0.1 and the coefficient of kinetic friction is 0.03. 25° ILL r (a) Calculate the minimum force F he must exert to get the block moving. (b) What is its acceleration once it starts to move, if that force is maintained?

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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!