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A block of 7 kg is placed on a rough hor...

A block of 7 kg is placed on a rough horizontal surface and is pulled through a variable force F(in N) =5t, where 't' is time in second, at an angle of `37^(@)` with the horizontal as shown in figure. The coefficient of static friction of the block with the surface is one. if the force starts acting at t=0 s, find the time at which the block starts to slide. (Take `g=10 m//s^(2)`)

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