Question

In the figure, two blocks are connected over a pulley. The mass of block A is 11.0 kg and the coefficient of kinetic friction between A and the incline is 0.300. Angle θ of the incline is 43.0°. Block A slides down the incline at constant speed. What is the mass of block B?

The tolerance is +-1 in the 3rd significant digit.

Answer 1

$$m_B=(\sin 43-0.3\cos 43)11=5.09\ kg$$