Posted by **Tammy** on Sunday, September 9, 2007 at 1:30pm.

a car manufacture advertise that a car goes "from zero to sixty in 8 seconds" is a description of:

a) average speed

b) instantaneous speed

c) average velocity

d) instantaneous acceleration

a) and b) are incorrect since it's a change in velocity, whcih means it's acceleration. I believe d) is the correct answer because it's the change in velocity at an instant. Is this correct?

- Physics -
**bobpursley**, Sunday, September 9, 2007 at 1:44pm
d is the best answer, but I would have worded it as average acceleration.

- Physics -
**Steph**, Tuesday, June 11, 2013 at 9:48pm
Its a question on scalar and vector quantities - speed and velocity have different meanings - speed has no direction, velocity does, hence given no direction, it would be speed. it is instantaneous as average would be 60-0 / 8 = x, whereas the manufacturer is trying to show greater speed, hence instantaneous speed.

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