Question

A car accelerates uniformly in a straight line
from rest at the rate of 2.8 m/s2
.
What is the speed of the car after it has
traveled 50 m?

Answer 1

this is my way of doing this:

(v final)^2 = (v initial)^2 + 2as

v^2 = 0 + 2(2.8m/s2)50m

v^2 = 280m2/2

v = 16.73 m/s

Answer 2

thank you so much!! :)

Answer 3

no problem

Answer 4

if you want, can you help me again. Now with the same question above, i need to find how many seconds it took the car to travel in 50m. Im just not getting what equation to use, do i find acceleration first?

Answer 5

no, you already have acceleration, which is 2.8m/s2. This is my way of doing this. Use the formula:

(v final) = (v initial) + at
16.73m/s = 0 + (2.8m/s2)(t)
=> t = 5.975s

Answer 6

Thank you! Youre a life saver