Question

An auto manufacturer advertises that their car can go "from zero to sixty in eight seconds." This is a description of what characteristic of the car's motion? A) instantaneous speed B) displacement C) average speed D) instantaneous acceleration E) average acceleration

Answer 1

Answer:

option D

Explanation:

If a₁ and a₂ are accelerations of the car at two times, the average acceleration can be calculated as:

$a_{avg}=\frac{a_1+a_2}{2}$

The instantaneous acceleration is the change in velocity in a time interval:

$a=\frac{dv}{dt}$

The car goes from 0 m/s to 60 m/s in 8 s refers to the instantaneous acceleration of the car.

$a=\frac{60-0}{8}=7.5 m/s^2$