A 10-Kg Mass Is Placed at the Top of a Smooth

Multiple Choice

A 10-kg mass is placed at the top of a smooth incline. The incline makes an angle of 30° with the horizontal. What should be the minimum horizontal acceleration of the incline so that the normal force exerted by the incline (acting on the mass) is zero?

A) 9.8 m/s $2$
B) 11 m/s $2$
C) 6.2 m/s $2$
D) 17 m/s $2$