Question

4.
Express each of the following speeds in metre per second.
(a) 72 km per hour b) 18 km per hour
( 144 km per hour​

Answer 1

Answer:

a) 72 km/h

$72 \times \frac{5}{18}$

$4 \times 5 = 20$

72 km/h = 20 m/s

b ) 18km/h

$18 \times \frac{5}{18}$

$1 \times 5 = 5$

18 km/hr = 5 m/s