Question

1 kg block is being pushed against a wall by a force F=75 N the coefficient of friction is 0.25. The magnitude of acceleration will be

Answer 1

AS Frictional force here is 0.25 multiply by 10 and applied force is 75 N
So acceleration will be force/mass which is 75-0.25/1 = 72.5 ms-2

Hope you get your answer.

Answer 2

The coefficient of friction = 0.25. The magnitude of acceleration =?

It is quite interesting that force has a value, only when the force applied on the body tends to move with acceleration which means velocity must keeps on increasing.

Force = Mass x Acceleration. Acceleration = force/mass. On substituting the values, we get 75 – 0.25/1 = 72.5 ms^-2.