Question

convert
a) 72 km/h to m/s
b) 30 m/s to Km/h
​

Answer 1

Answer:

72km/h = 72 × 5 = 4 × 5 = 20 m/s

__

18

Ans. 20 m/s

30 m/s = 30 × 18 = 6 × 18 = 108 km/h

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5

Ans. 108 km/h

Hope it helps.

Answer 2

As we know that how to convert a speed of km/hr into m/sec, multiply by $\dfrac {5}{18}$ & to convert a speed of m/sec into km/hr, we multiply by $\dfrac {18}{5}$

Given:

a) 72 km/hr to m/s

Solution:

${72}\times \dfrac{5}{18} \: = \: 20$

Hence, the required speed is 20 m/sec.

b) 30 m/sec to km/hr

Solution:

$30 \times \dfrac{18}{5} \: = \: 108$

Hence, the required speed is 108 km/sec.