Arugby player tackles another player. in terms of kinetic energy and work done, why is it more difficult to tackle a heavier player travelling at the same speed?

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

the answer would be   dignified - apex