Convert 18 kmhr in ms.
10m/s
12m/s
8m/s
5m/s
We know that 1000 m = 1 km and 3600 s = 1 hour
so,18 km = 180000 m
and 1hr = 3600 s
∴18 km/hr=180003600=5 m/s
36 kmhr =___ ms
V = 3 + 9t if t < 9
V= 8 - 2t if t =10
Find the value of v (m/s) when t = 10