WEBVTT
00:00:00.000 --> 00:00:03.160
This is Giancoli Answers
with Mr. Dychko.
00:00:04.140 --> 00:00:06.800
Acceleration is the change
in velocity over time
00:00:06.800 --> 00:00:09.120
so we have the final velocity
minus initial velocity
00:00:09.120 --> 00:00:11.280
divided by the time it takes
to make the change.
00:00:11.480 --> 00:00:14.440
So we have 21 meters per second
final for the car minus
00:00:14.440 --> 00:00:18.520
its initial velocity of 14 meters per
second divded by 6 seconds
00:00:18.520 --> 00:00:22.840
gives an acceleration of 1.2 meters
per second squared.
00:00:23.200 --> 00:00:27.740
The distance that it travels during this time
is its average velocity
00:00:27.740 --> 00:00:31.100
times time and the average is, you know,
in the case where you have
00:00:31.100 --> 00:00:34.380
constant acceleration, you can just take
the initial and the final
00:00:34.380 --> 00:00:35.700
and divide by 2.
00:00:35.880 --> 00:00:38.280
So we have 14 meters per second
plus 21 meters per second
00:00:38.280 --> 00:00:40.840
divided by 2 times by 6 seconds
00:00:40.840 --> 00:00:44.900
gives us a 110 meters when you
round it to two significant figures.