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

Multiple Choice

A 250-kg crate is placed on an adjustable inclined plane.If the crate slides down the incline with an acceleration of 0.25 m/s² when the incline angle is 25°,then what should the incline angle be for the crate to slide down the plane at constant speed? Note: g = 9.8 m/s².

A) 12°
B) 21°
C) 24°
D) 29°