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