16.Which of the following is a unit of speed?
a km
b.min
c.m/s
d.cm
17.What is the speed of a ball that moves to about 10 meters in 2 seconds?
a. 20m/s
b. 5m/s
c. 1 m/s
d. 50m/s
18.Which of the following shows the slowest velocity?
a.20km/h north
b.10km/h south
c.5km/h north
d.50km/h
19.What is the basic unit for measuring time?
a.hour
b.second
c.minute
d.month
20.A biker covers a distance of 150km in five hours.What is the Biker's speed?
a.15km/h
b.30km/h
c.45km/h
d.60km/h​