What additional force must be applied so that the block does not accelerate?

a. 40 n east
b. 40 n west
c.10 n east
d.10 n west

D. 10 N west.

Explanation:

Forces along the west and east must be equal to make block static. Let F1 is the force along east, F2 is the force along west. So,

                                   F1=F2

                                   25=15+F

Where, F is the additional force required along west to keep bock in steady state.  

                                    F = 10 N west.

Hence, when 10N additional force is applied along west then block will not accelerate.

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