the speed of an object falling is directly proportional to the time it has fallen. after an object falls for 3 seconds, its speed is 16.5 m/s. what is the object's speed after it has fallen for 7 seconds?

Your answer is: increased air temperatures  hope this ! : )

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.