A block is moving on a rough surface. At...

A block is moving on a rough surface. At time t = 0, speed of the block is 20 m/s. Coefficient of friction `(mu)` between block and surface varies with time (t) as shown in figure. The magnitude of velocity of particle after t = 2 second is (g = 10 ms^-2)

-2.5 m/s

17.5 m/s

15.0 m/s

Zero

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