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A block of mass m rests on a rough floor...

A block of mass `m` rests on a rough floor . The coefficient of friction between the block and the floor is `mu`
a. Two boys apply force `P` at an angle `theta` to the horizontal. One of them pushes the block , the other one pulls. Which one would reqire less efferts to cause impending motion of the block?
b. What is the minimum force required to move the block by pulling it ?
c. Shown that the block is pushes at a certain angle `theta _(0)` it cannot be moved fro whatever the value of `P` be

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