Question

A plank of mass m, with a bar of mass m, placed on it lies on a smooth horizontal plane. A horizontal
force growing with timetas F=kt (k is constant) is applied to the bar. Find how the accelerations of
the plank a, and of the bar a, depend ont, if the coefficient of friction between the plank and the bar
is equal to u. Draw the approximate plots of these dependences.​

Answer 1

Answer:

Answer as explained in the picture.