A ball is thrown straight up from point a, reaches a maximum height at point b, and then falls back. Which of the following is true about the ball’s acceleration the highest point b?.

Which of the following is an example of an opposing signal? no examplthates given.   i would say, that traffic lights in a city at major intersections direct the flow of traffic in opposite directions so would be an example.also, stop signs on either side of the same street would be an example. at a train crossing, the light for allowing car traffic in opposite directions or not would be another example.