00:01
In this video, we have a velocity versus time graph for a bowling ball dropping onto a trampoline and bouncing back.
00:10
And what that graph looks like is we start at time t equals zero here.
00:20
Okay, so this is t.
00:22
Actually, now i'll make it right here.
00:25
T equals zero.
00:27
Okay.
00:33
And this will be velocity.
00:35
This is v equals zero.
00:37
Equals zero.
00:38
So what this graph looks like is we start at v equals zero.
00:41
We release the ball.
00:43
Okay, it increases in velocity in the negative direction till it lands on the trampoline where it sharply increases in velocity and then it rises to some maximum peak height where velocity is zero and then we begin to come back down towards the trampoline.
01:04
Now a student observing this notices that the ball's speed after it bounces off the trampoline is less than the ball's speed as it approaches the trampoline.
01:19
And now this student is going to make two hypothetical statements about this experiment or this just this little demonstration.
01:28
Okay.
01:30
And we want to say if his statements are correct or incorrect.
01:33
So the first statement is he says if the ball bounced such that its final speed equals its initial speed.
01:44
Okay...