A crate is slid across a floor. The mass of the crate is 200kg and the coefficient of static friction is 0.30. How much force is needed to keep the crate moving to the west with a constant velocity of 7m/s? A crate is slid across a floor. The mass of the crate is 200kg and the coefficient of static friction is 0.30. How much force is needed to keep the crate moving to the east with a constant velocity of 4m/s?