A block of mass 4 kg is placed on a rough horizontal plane. A time dependent horizontal force F = kt acts on the block (k = 2 N/s). Find the frictional force between the block and the plane at t = 2 second and t = 5 second (mu = 0.2)

A block of mass 4 kg is placed on a rough horizontal plane. A time dep

1.	A block of mass 4 kg is placed on a rough horizontal plane. A time dependent horizontal force F = kt acts on the block (k = 2 N/s). Find the frictional force between the block and the plane at t = 2 second and t = 5 second (mu = 0.2)
Answer» SOLUTION :When t=2sec F=4N `f_(ms)=mu" mg"=0.2xx4xx10=8N` `:. Fltf_(ms) :."friction"=4N` When t=5sec F=2(5)=10N, `Fgtf :." friction"=8N`