A 150-Kg Crate Is Placed on an Adjustable Inclined Plane

Multiple Choice

A 150-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 20°,then what should the incline angle be for the crate to slide down the plane at constant speed? (g = 9.8 m/s²)

A) 21°
B) 16°
C) 11°
D) 26°
E) ​6°