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Q.

A block of mass 2 kg is on a horizontal surface. The co-efficient of static & kinetic frictions are 0.6 & 0.2 The minimum horizontal force required to start the motion is applied and if it is continued, the velocity acquired by the body at the end of the 2nd second is (g=10 ms−2)

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a

2 ms−1

b

zero

c

4 ms−1

d

8 ms−1

answer is A.

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Detailed Solution

Question Image

m=2kg, μs=0.6, μk=0.2

a=Fnetm=Flim−fkm

=0.6×20−0.2×202

=4 m/s2

v=u+at

=4×2  

v=8 m/s

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