"A crate with a mass of 45 kg is suspended from a massless rope that runs vertically upward over a light pulley. The other end of the rope is connected to a 35 kg crate, which lies on a tabletop. The coefficients of the kinetic friction and the static friction between the crate and the surface are 0,3 and 0.5 respectively An applied force, F. pulls the 35 kg crate to the right. In the third case, the 35 kg crate moves to the right at a constant acceleration of 0.5 m/s.

How much force would need to be applied in the third case?