Question

Which set of measurements correctly identifies the speed of an object?

A.
Distance = 18 m
time = 2 hr
speed = 9m/hr
B.
Distance = 30 km
time = 17 min
speed = 1.8 km/hr
C.
Distance = 3 cm
time = 12 min
speed = 36 cm/min
D.
Distance
2 km
time = 24 sec
speed = 48 km/sec

Answer 1

A. Distance = 18 m

time = 2 hr

speed = 9 m/hr

Step-by-step explanation:

Speed is the same thing as velocity.

Velocity = distance/time

18m/2hr = 9m/hr

For choice B, the numbers are right, but the units are mixed (minutes were changed to hours)