La gráfica de posición – tiempo corresponde a un cuerpo que se desplaza en una trayectoria rectilínea. a. ¿En qué intervalos las velocidad es negativa y cuales es positiva?
b.¿en qué intervalos la velocidad es cero?

Would it be correct to say the doppler effect is the apparent change in the speed of a wave due to the motion of the source? be sure to fully explain your position using at least 3 complete content related sentences.

When solid surfaces slide over each other the kind of friction that occurs is called friction

Suppose that two objects attract each other with a gravitational force of 16 units. if the distance between the two objects is double, what is the new force of attraction between the two objects?