alleryA car accelerates uniformly from 18 km/h to 72 km/h in 5 s. What is the acceleration of the car?
A10.8 m/s²
B13.5 m/s²
C6 m/s²
D3 m/s²
Answer & Solution
Correct answer: D. 3 m/s²
1. Convert speeds: 18 km/h = 5 m/s, 72 km/h = 20 m/s.
2. Acceleration a = (v − u) / t = (20 − 5) / 5.
3. a = 15 / 5 = 3 m/s².
_Source: RRB Group D CEN-02/2018 PYQ, Q.4._
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