Time? odd question
are you telling us that
force=t^2-t+4? That is very odd indeed.
20*9.8*.3=t^2+t+4
work that out, and solve the quadratic.
A block of mass 20kg is at rest on a rough horizontal ground,the coefficient of friction between the block and the ground is 0.3.A horizontal force is applied steadily to the block according to the law,F= t^2-t+4.calculate the time it takes the block to start moving.
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