Question

Express each of the following speeds in metres per second.
(a) 72 km per hour (b) 18 km per hour (c) 144 km per hour
dc in km/h​

Answer 1

Answer:

a) 72 km/ h

72×1000/60×60

72000/3600

=20m/s

b) 18 km/h

18×1000/60×60

18000/3600

=5m/s

c) 144km/h

144×1000/60×60

144000/3600

=40m/s

Answer 2

1) 72 × 5/18 = 20 m/s

2) 18 × 5/18 = 5 m/s

3) 144 × 5/18 =40 m/s

hope it's helpful