00:01
Hello students, let's assume it takes t seconds for you to reach the door of the bus.
00:09
Seconds.
00:11
And in t seconds, you traveled.
00:15
This one equals to 4 .9 into t meter traveled.
00:25
And in t seconds, the bus traveled is 2 equals to half a t squared.
00:39
This half one is acceleration into t squared.
00:44
That is 0 .5 t squared.
00:48
Now, this one minus this two equals to 9 meter.
00:54
So 4 .9 minus 0 .5 t squared equals to 9 or we can rearrange it at 0 .5 t squared minus 4 .9 times t plus 9 equals to 0.
01:23
So solving this will have t equals to 4 .9 minus 4 .9 squared minus 4 .9 0 .5 divided by 2 into 0 .5 the unit of second that is equals to 2 .4 second.
02:03
So it takes 2 .4 second for you to catch the bus.
02:07
Now the maximum type you can wait until the bus reach your speed.
02:21
That is 4 .9 meter per second...