Three identical blocks of mass m on a frictionless surface are connected by massless taut strings. A force Fis applied on the rightmost block as shown in the figure below so that each block moves to right with acceleration a. m m Applying Newton's second law on the rightmost block: EFx = = ma Applying Newton's second law on the block at the center: IFx - T2- Applying Newton's second law on the leftmost block: ZFx= ma If each block has a mass of 10 kg and is accelerating at 2 m/s, the magnitude of the tension on the second string is 72 = N.

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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!