If the regression co-efficients are 0.8 and 0.2, then the value of co-efficient of the correlation is

If the regression coefficients y on x and x on y respectively are 0.8 and 0.2, what would be the value of coefficient of correlation?

Define co-efficient of restitution'?

For an elastic collision the value of co-efficient restinction is:

Define co-efficient of viscosity.

Define the co-efficient of restitution.

The dimension of co - efficient of viscocity is