Question

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.
bobpursley
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.

Related Questions

A force of 40 N is applied at an angle of 30oabove the horizon to a 5 kg block that is at rest on a... A force of 50 N directed 30 degrees above the hoizontal is applied to a 10-kg block at rest on a rou... A metal block of mass 5kg lies on a rough horizontal platform.If a horizontal force of 8N applied to...