Question

On a large tray of mass M an ice cube of mass m, edge L is kept. If the ice melts completely the centre of mass of the system comes down by​

Answer 1

Explanation:

It is a large tray,so when ice melts the level of water is negligible.

Shift in COM is basically the level of COM before melting 

ycm before melting  

=m×L/2/(m+m)

=mL/2(m+m)