magínese en el castillo del abismo de Helm del Señor de los Anillos. Usted estáen la cúspide del muro del castillo soltando rocas sobre monstruos de todas clases que están a 18.35 m debajo de usted. En el momento en que suelta una roca, un arquero que estáubicado exactamente debajo de usted dispara una flecha de manera vertical hacia arriba con una velocidad inicial de 47.4 m/s. La flecha impacta la roca en el aire. ¿Cuánto tiempo después de que usted soltóla roca sucede esto? Respuesta: 0.387 s

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

the answer is 100. i just did this lesson and got a 100% on it. : )

-fishtank