A 250-Kg Crate Is Placed on an Adjustable Inclined Plane $\degree$

Multiple Choice

A 250-kg crate is placed on an adjustable inclined plane.If the crate slides down the incline with an acceleration of 0.70 m/s² when the incline angle is 25 $\degree$ ,then what should the incline angle be for the crate to slide down the plane at constant speed? (g = 9.8 m/s²)

A) 12 $\degree$
B) 21 $\degree$
C) 25 $\degree$
D) 29 $\degree$