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Determine the time taken by the stone to reach the ground.Assume the acceleration due to gravity is 9.8 ms A police car is parked at the side of a highway with its engine running. The police immediately give chase, moving with a constant acceleration until they catch the speeding car after 50 s.For instance, if you are using Solve the equation carefully and when you have an answer, think about it to check that it makes sense.
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Almost always, the two quantities are, as the category suggests, directly related through the definition of one of the quantities (e.g.
density is defined as mass/volume, so mass and density are very closely linked.) A specific category in which you see this close relationship is rate questions (velocity is the rate at which displacement changes so velocity and displacement are very closely linked.) You seldom need a picture for definition equations—you tend to be told two quantities and asked for a third that is related through a single equation.Exceptions are cases in which you can’t visualize what the equation means or where it came from, or in which you are asked to look at multiple points and need to keep the given information straight.In those cases, the picture tends to be a well-labeled picture of the actual situation, rather than an abstract picture such as a free body diagram.The speeding car maintains a constant speed of 30 m/s throughout the chase.Live is dedicated to physics, science, space and technology news.Compare the average speed and the average velocity for this journey. This is not one continuous trip where a train accelerates uniformly from 100 km/h to 150 km/h and we want to calculate its average speed over that period of time.The train in this question must accelerate and decelerate albeit briefly on each leg of its journey.A stone is thrown vertically upwards with a velocity of 29.4 m/s from the edge of a cliff 78.4 m high.The stone falls so that it just misses the edge of the cliff and falls to the ground at the foot of the cliff.It is easier to manipulate equations using pro-numerals rather than numerals.Having performed any required re-arrangement, substitute the data, making sure to use both appropriate units (usually SI Units) and appropriate signs ( or -) for all vector quantities.