A car moving with speed 54 km/h is stopped in 5 s. The distance covered before stop is MCQ with Answer and Explanation

A car moving with speed 54 km/h is stopped in 5 s. The distance covered before stop is
A. 54 m
B. 37.5 m
C. 27 m
D. 75 m
Answer: Option B
Solution (By JKSSB Mock Tests)
54 km/h = 15 m/s. u=15, v=0, t=5. a = (0-15)/5 = -3 m/s². s = ut+½at² = 15×5 + ½×(-3)×25 = 75 - 37.5 = 37.5 m. Or s = (u+v)/2 × t = 7.5×5 = 37.5 m.

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