00:01
Hello student, in this problem we will have to find the horizontal speed of the ball when kale catch it.
00:08
Now we can find the speed of the ball from the conservation of horizontal momentum.
00:18
Conservation horizontal momentum.
00:38
Initially kale had no speed horizontally so his momentum will be 80 into 0 horizontal direction.
00:49
The ball had some speed let's say v is the speed of the ball so 0 .43 times v is the momentum of the ball.
00:59
Now finally when kale catch the ball their total mass is 80 .43 and they had some horizontal speed let's say v dash where v is the horizontal speed of the ball and v dash is the horizontal speed of the speed of kale with the ball.
01:21
Now let us consider let's consider t be the time taken by kale to reach the ground from a height of from a height of 0 .538 meter.
02:10
So we can find the value of t from the equation s equals to u t plus half f t square.
02:22
So here u is 0 so s equals to half f t square.
02:30
So we can find t so s here is the height so 0 .538 of t is 9 .8 times t square...