The angle of incidence is equal to angle of reflection is the law of MCQ with Answer and Explanation

Explanation:
Sound travels fastest in solids. Iron ~5000 m/s.

Explanation:
Impulse = F Δt.

Explanation:
Acceleration a = (v-u)/t = (8-2)/10 = 0.6 m/s². Force F = m×a = 5 × 0.6 = 3 N. Alternatively, impulse = change in momentum = 5×(8-2) = 30 kg m/s, time = 10 s, so average force = 30/10 = 3 N. Always check direction, but magnitude is 3 N.