- #1
colin_delecia
- 4
- 0
Homework Statement
A car slows down from 25 to rest in a distance of 75 .
What is the acceleration of the car.
I've been fiddling with this problem pretty much all night but can't seem to get to a correct answer, help would be apprechiated.
Homework Equations
x = x0 + v0t + 1/2at^2
d = 1/2(v0 +v)t
The Attempt at a Solution
x = x0 + v0t + 1/2at^2
75m = (25m/s)(60.5s) + 1/2a(60.5s)^2
75m = 1512.5m + 1/2a(60.5s)(60.5s)
75m = 1512.5m + 1/2a(3660.25s^2)
75m - 1512.5m = 1512.4m - 1512.4m 1/2a(3660.25s^2)
-1437.5m = .5a(3660.25s^2)
------ ----------------
.5 .5
-2875 = a(3660.25s^2)
------ -------------
3660.25 3660.25s^2
-.79m/s2
AND
-25m/s
------
60.5s = -.42m/s2
Last edited: