how do I solve:
. A 5-kg fish swimming at 1 m/s swallows an absentminded 1-kg fish swimming toward it at a velocity that brings both fish to a halt. Show that the speed of the smaller fish before lunch was 5 m/s.

Question

how do I solve:
. A 5-kg fish swimming at 1 m/s swallows an absentminded 1-kg fish swimming toward it at a velocity that brings both fish to a halt. Show that the speed of the smaller fish before lunch was 5 m/s.

abhisar · Answer

Hello @beccamarx19 !

abhisar · Answer

Let the speed of the small fish before lunch be x m/s

abhisar · Answer

Now by using Principle of conservation of linear momentum (m1v1 = m2v2)

abhisar · Answer

-5 * 1 + x * 1 = 0

abhisar · Answer

Solving this we get x = 5

abhisar · Answer

got it ?

anonymous · Answer

how did you get that?

anonymous · Answer

i got that never mind

abhisar · Answer

are uh sure ?

anonymous · Answer

if it is -5*1 it equals -5  then x*1 =0 -5+5 equal 0

abhisar · Answer

No, 
-5*1 + 1*x = 0,
then, -5=-x,
then, 5=x

anonymous · Answer

meaning x has to be 5 in order for it all to equal 0

abhisar · Answer

yes

anonymous · Answer

right i think i got it thank you

abhisar · Answer

Did you know you can give medals to people who help you with questions? Just click the $\color{blue}{\text{blue "best response" button}}$ to show appreciation for the people who help you.

abhisar · Answer

Feel free to tag me in if u hav more doubts $\color{green}{\huge\ddot\smile}$

anonymous · Answer

how do i do that i posted another question already

abhisar · Answer

just add @ with anyones name u want to tag like if u want to tag me write @abhisar