Given:
The mass of the person A is

The mass of the person B is

The initial velocity of A and B is zero as it is at rest.
The final velocity of person B is

towards right.
To find the velocity of A.
Step-by-step explanation:
According to the conservation of momentum, the final velocity of person A will be

On substituting the values, the final velocity of person A will be

Here, the negative sign indicates that the final velocity i