A hollow spherical ball is given an initial push up an incline of inclination angle α. The ball rolls purely. The coefficient of static friction between the ball and incline = μ. During its upwards journey.
A. friction acts up along the incline
B. μₘᵢₙ = ( 2 tan ∝)/5
C. friction will be no rotation if ℎ = R
D. μₘᵢₙ = (2 tan ∝)/7