9. A train starts from rest and reaches a velocity of 36 km/h36\,\text{km/h}36km/h in 20seconds. What is its acceleration in m/s²?
Answer (1)
Given:Initial velocity, u = 0 (starts from rest)Final velocity, v = 36 km/hTime, t = 20 sStep 1: Convert velocity to m/s36 km/h × (1000 m / 1 km) × (1 h / 3600 s) = 10 m/sStep 2: Use acceleration formulaAcceleration, a = (v − u) / ta = (10 − 0) / 20 = 0.5 m/s²Answer: 0.5 m/s²
