00:01
Hi, in this question, we have a tennis ball rebound on the wall.
00:07
So it came at the wall at the velocity of 20 .9.
00:10
So that will be the initial velocity you.
00:16
So we're told in the question that we should take towards the wall as the positive direction.
00:21
So this comes in towards the wall.
00:23
So this is plus 20 .9 meters per second.
00:27
And the final velocity, when it rebounds, that will be v.
00:31
And this is a bit negative because it goes away from the wall.
00:33
So this is minus 10 .7 to 17.
00:37
That's my second.
00:39
Once find the average acceleration a, we have the time as equal to 0 .0112.
00:50
So i'm going to use the equation...