Question

Which of the following in NOT an acceleration unit? List all that apply
-km/hr/s
-km/hr/hr
-m/s2 (it's supposed to be squared)
-km/s
-m/s/s

Answer 1

An acceleration unit needs a unit of length or distance on top and a unit of (time · time) on the bottom.  Let's go through the list:

- km/hr/s = (km) / (hr · sec) . . . Yes

- km/hr/hr  = (km) / (hr · hr) . . . Yes

- m/s² = (m) / (sec · sec) . . . Yes

- km/s  = (km) / (sec) . . . No . . . This is the only one that's NOT acceleration.  This one is actually a unit of speed .

- m/s/s = (m) / (s · s) . . . Yes

Answer 2

Unit of acceleration is not Km/s. Therefore, option D is the correct answer.

• Kilometer (Km) is the unit of length and second (s) is the unit of time. Length/time is speed. Therefore, km/s is the unit of speed.
• Acceleration is defined as the rate of change of velocity with respect to time. It is vector quantity. Acceleration = velocity / time .

• Unit of acceleration=unit of velocity/unit of time .
• Unit of acceleration will be km/s2, km/hr2, m/s2.

Thus, we can conclude that Km/s is not the unit of acceleration. Therefore, option D is the correct answer.

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