A block of weight 100 N is pushed by a force F on a horizontal rough plane and moves with an acceleration , when force is doubled its acceleration becomes . The coefficient of friction is
0.2
0.4
0.6
0.8
Weight, W =100 N
Acceleration,
Acceleration when force is double,
Now, Let the External Force be 'F' and the friction force be ' '.
Then,
We know, When Force is doubled, Then,
Now, from equations (I) and (II)
Now, put the value of F in equation (I)
Hence, the coefficient of friction is 0.8