Question

31. A block of mass 10 kg is moving on a rough surface as shown in figure. The frictional force acting on block
v = 4 m/s
F = 20 N
10 kg
u = 0.6
(2) 60 N
(1) 20 N
(3) 40 N
(4) 80 N
​

Answer 1

Answer:

2)60

Explanation:

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Answer 2

Answer:

60 N

Explanation:

If body is moving on rough surface

Frictional force:-

=μmg

=0.6×10×10

=60N

Since friction is self adjusting force maximum forc eof 60N is acting, but here only External force = 20N is acting so friction can acts is 20N

If external force increases then f will increase and go upto 60N beyond which object will move.