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```        quest---two particles of mass
1kg n 3kg move towards each
other under their mutual force
of attraction. no other force
acts on dem.tjheir rel...velocity
of approach is 2m/s. find vel.of
centr of mass/.
well mjhe quest galat lag raha
tha......wat u thnk.......since its
ans is nt given.. so m nt
confirm```
7 years ago

Aakash Dutta
29 Points
```										Well I also think that it is incomplete
The initial conditions are not given
Are they at rest?
If yes then
The v of COM remains unchanged = 0
```
7 years ago
419 Points
```										Dear Hemant
Question is correct
suppose particles(m and 3m) are placed at some distance r. take origin at m
position of centre of mass= m*0+3m*r/4m = 3r/4 from m
now if they start moving then from action reaction force on both will be same but due to mass difference acceleration will not be same. if acc of m is a then acc of 3m will be a/3. so there will be relative acceleration they will move towards each other with relative acc of 4a/3 and the value of a will not be constant. as gravitational force is proportioal to 1/r2 hence a is also proportional to 1/r2. centre of mass will also change its position as both move with diff acc and diff velocity.
so please confirm the question that is the force constant or v=2m/s is at what instant.
All the best.
AKASH GOYAL

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```
7 years ago
SAGAR SINGH - IIT DELHI
879 Points
```										Dear student,
Here concept of reduced mass wll be used..
Mr=m1m1/m1+m2

All the best.
Win exciting gifts by                                                                                                                    answering     the               questions       on                       Discussion                    Forum.      So                help                          discuss                any                             query      on                        askiitians            forum      and                 become     an                 Elite                          Expert            League                                 askiitian.

Sagar Singh
B.Tech, IIT Delhi

```
7 years ago
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