Question

Please give me the answer of my above question

And p please don't spam​

Answer 1

Answer:

Q1 Initial momentum of the system is 0 as it is at rest.

After firing MV=mv 

⟹V=Mmv=20.02×150

⟹V=1.5m/s

Q2 Given :   Mgirl=40 kg           ugirl=5 m/s        Mcart=3 kg

Initial velocity of cart  ucart=0

Let the final velocity of cart be  V.

Applying conservation of linear momentum :    Pi=Pf

Or    Mgirlugirl+Mcartucart=(Mgirl+Mcart)V

Or    40×5+3×0=(40+3)V