How long would it take for a resultant upward force of 100 N to increase the speed of 50 Kg object from 100 m/s to 150 m/s ? With explanations pleaseand the very ways..
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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 displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement