The man pushes on the 60-lb crate with a force F The force is always directed down at 30°...

The man pushes on the 60-lb crate with a force F The force is always directed down at 30° from the horizontal as shown, and its magnitude is increased until the crate begins to slide. Determine the crate’s initial acceleration if the coefficient of static friction is µs = 0.6 and the coefficient of kinetic friction is µk = 0.3.