Marsha is pushing down and to the right on a 19-kg box at an angle of 30° below horizontal. The box slides at constant velocity across a carpet whose coefficient of kinetic friction with the box is 0.70. What quantities can be determined using this information? Check all that apply. force exerted by Marsha on the box friction force exerted by the surface on the box mass of Marsha velocity of the box normal force exerted by the surface on the box

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