Answer:
0.4km/s
Explanation:
To be able to know the greatest speed out of all the speed values, we will have to convert the velocities value to m/s.
Converting velocity of 400cm/s to m/s, we have;
400cm/s × 1m/100cm
= 4m/s
Since 100cm = 1m
For velocity of 0.4km/s, we have;
0.4km/s × 1000m/1km
= 400m/s
Note that 1000m = 1km
For velocity 40,000mm/s, we have;
40,000mm/s× 1m/1000mm
= 40m/s
Since 1000mm = 1m
Therefore among all the converted values, the velocity of 0.4km/s which is equivalent to 400m/s is the greatest.
