00:01
Here is our two sleds and our little cat that's going to jump from this sled to this sled.
00:06
The cat's mass is 4 kilograms.
00:08
Each sled has a mass of 20 kilograms, and the cat's speed with respect to the ice is 3 meters per second after it jumps off of the first sled.
00:18
So the first question asks, what's the speed of this sled after the cat jumps off? and for this, we can treat it like an explosion reaction.
00:26
So an explosion conservation and momentum problem.
00:31
So the initial momentum is going to be zero.
00:34
And then the cat's going to have some momentum to the right minus the momentum of the sled to the left.
00:40
And so we can solve this for v2 by first adding this to both sides and then dividing both sides by the mass of the sled.
00:48
So the velocity of the sled is equal to the momentum of the cat divided by the mass of the sled.
00:56
And we get four times three for the cat divided by 20.
01:00
And the speed of the sled is going to be 0 .6 meters per second to the left.
01:06
Next, we need to find the speed of this sled after the cat lands on it.
01:11
And for this, it's going to be an inelastic collision.
01:15
So we have the momentum of the cat before it lands on the sled...