Question

The momentum of a body is 50 %, the percentage increase in it

Answer 1

125%

Let the original momentum of a body be a units.
Then, the original surface area of the cube = 6a2 units

New edge of the cube = 150% of a
                                
Hence, new surface area
                                    
Increase in area
                       
% increase in momentum of a body = 125 %