Question

ERCISE - 2.3 B (CLASS WORK)
The velocity of car changes from 18 km/h to 72 km/h in 30s. What will be its acceleration in
km/h' and in m/s?
1) 6480 km/h?, 0.50 m/s?
3) 6580 km/h, 0.30 m/s2
2) 6450 km/h2, 0.40 m/s2
4) 6840 km/h?, 0.50 m/s2​

Answer 1

$a = \frac{72 - 18}{30 \: s} \\ \\ = \frac{54}{30} \times 60 \times 60 \: hr \\ \\ = 6480\: km {h}^{ - 2} \\ \\ = > a = \frac{54}{30} \: km \: {s}^{ - 2} \\ \\ = \frac{54 \times 1000}{30} \: m {s}^{ - 2} \\ \\ = 1800 \: m {s}^{ - 2}$