Posted by Tammy on .
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,
d is the best answer, but I would have worded it as average acceleration.

Physics 
Steph,
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 600 / 8 = x, whereas the manufacturer is trying to show greater speed, hence instantaneous speed.