A 20 kg wooden crate is dragged 12 m across a rough level floor by a rope. The force of

A 20 kg wooden crate is dragged 12 m across a rough level floor by a rope. The force of tension in the rope is 50 N at an angle of 25° above the horizontal and the crate is moving at a constant speed of 1.50 m/s. Find the magnitude of the normal force [N].