Q. A car moves with a speed of 20 m/s and comes to rest in 5 s. The retardation is:
✅ Correct Answer: (B)
4 m/s²
Explanation: Acceleration a = (v - u)/t = (0 - 20)/5 = -4 m/s². Retardation is 4 m/s².
Explanation by: Jyoti
Acceleration a = (v - u)/t = (0 - 20)/5 = -4 m/s². Retardation is 4 m/s².