3. A sled is pushed along an ice covered lake. It has some initial velocity before coming to a rest in 15m. It took 23 seconds before the sled and rider come to a rest. If the rider and sled have a combined mass of 52. 5 kg. What is the magnitude and direction of the stopping forcing?.

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.