El extremo de un brazo robotico se mueve hacia la derecha a 8m/s. cuatro segundos despues se mueve hacia la izquierda a 2m/s.¿Cual es el cambio de velocidad y cualñ es la aceleracion?

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.

i believe the answer is electric potential.

explanation:

you get 2.3=1.21*\frac{a}2 or 4.6=1.21a or a=3.802 (b)

explanation: