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A block is projected with speed 20 m/s o...

A block is projected with speed 20 m/s on a rough horizontal surface. The coefficient of friction `(mu)` between the surface varies with time (t) as shown in figure. The speed of body at the end of 4 second will be `(g=10m//s^(2))`

A

2 m/s

B

5 m/s

C

7.2 m/s

D

9.5 m/s

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