if the mass of the object is tripled and the speed is doubled then the kinetic energy will change by a factor of

New kinetic energy = 12 times of the initial kinetic energy.

Explanation:

The kinetic energy of an object is given by :

Where

m is mass of the object

v is speed of the object

ATQ,

If the mass of the object is tripled, m' = 3m

Speed is doubled, v' = 2v

New kinetic energy will be:

So, the new kinetic energy will become 12 times of the initial kinetic energy.

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.