Three blocks (labeled 1,2, and 3), each with different mass, have a forceexerted on them. The resulting acceleration is plotted below. The mass of block 2 is 36kg. What are the masses of the other two blocks?" I used the slopes of each acceleration, like a1= 3, a2= 1, a3 =0.4, but now what?

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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!