Question

47. A block is projected with speed 20 ms on a rough
horizontal surface. The coefficient of friction ()
between the surfaces varies with time in as shown
in figure. The speed of body at the end of 4 second
will be g 10 )
ost
03
(1) 2 m/s
(3) 72 m/s
(2) 5 m/s
14) 95 m/s​

Answer 1

2 metre per sec is the sure answer..

Explanation in picture

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