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

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`)

A

2.5m/s

B

17.5m/s

C

15.0m/s

D

Zero

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