Answer to Question #103193 in Mechanics | Relativity for fatimah

Question

Message: 5) A car accelerates at 4 meters/s/s. Assuming the car starts from rest, how far will it travel in 10
s?
i use equation of kinamtic formula and it is wrong why?
D=vit+.5at^2 ?
why it is not correct to use this formula?
vi= 0

Answer 1

Given:

$v_i=0\:\rm m/s;$

$a=4\:\rm m/s^2;$

$t=10\:\rm s.$

The distance

$$d=v_it+\frac{at^2}{2}=0\times 10+\frac{4\times 10^2}{2}=200\:\rm m.$$