A solid sphere and a hollow sphere of same mass and radius are rolled down an incline. Which reaches bottom first? MCQ with Answer and Explanation

Explanation:
T ∝ √L, L'=4L => T' = √4 T = 2×2 = 4 s.

Explanation:
Different colours have different speeds/refractive indices in glass, causing dispersion.

Explanation:
Maximum friction = μN = 0.4×50 = 20 N. Weight = 50 N. Friction < weight, so block will fall. Wait, force 50 N horizontal, weight 5×10=50 N. Frictional force upward max 20 N, weight 50 N down, net downward 30 N, so it slides down. So it falls down. Answer A. Let's correct: option A: Falls down. I'll set A.