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Thanks a bunch, you saved my neck!!! To make this problem easier, convert your velocity to standard units which will be in meters per second. Remember, however, that you are solving for the distance, not the velocity. So, solve the equation for the distance. This will come in handy when the problems become more complex. Once you solve for the distance, plug in your information and solve. Draw a picture for most of the physics problems you do is the best advice I can probably give you.
Each segment in this picture represents 40 km. Determine that the best equation to use for this problem is the velocity equation. Your first instinct may be to add both of the velocities and divide that number by 2 to get your average. If each segment took an hour, for instance, you can add the velocities and divide by 2.
Not in this case, however. Take your velocity equation and solve for time. Plug in your values to find the times for each of the segments. To find the average velocity, we must find the total distance traveled and divide it by the change in time which is the times totaled together. In this case, the average velocity happens to be the same as the average speed. Remember that the speed is not a vector quantity, so the direction is irrelevant. Calculate the average speed for the round trip.
We discussed earlier that your distance is some unknown value x. Use your average speed equation and solve for the time. You will solve for the time for each segment. You will not have some specific number. Add the times of the two segments you just obtained. That is your change in time or the time it takes for the automobile to travel. You have two unknown distances that you have assumed are the same length.
Simply add your two unknown distances together to find the sum. You now have the change in time and the total distance. Plug this into your average speed equation and you will obtain the answer. The world speed record for a bike human powered vehicle was set by Chris Huber typo when I did the problem, thought it was Hubber , and his time through measured m stretch was a sizzling 6. You are going to be playing with and comparing velocities in this problem. What is the total distance the bird travels before the trains collide?
This problem is a little wordy, so you may have to read this a few more times more than you would with other problems. I read this more than half a dozen times. Since the trains are on the same track, you have to consider both of their velocities.
You know that the bird only travels until the trains collide. You know that the trains collide in 1 hour. Use the velocity equation and sub in the time the trains take to collide in for the time. Sub in your information and solve. It was easier than you thought, I know!
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Khan on Average Velocity and Average Speed. Easy During a hard sneeze, your eyes might shut for 0. List Your Givens First things first, list all your given information so you can see what information you have.
We see displacement is zero,and distance travelled =$2m$.Also acceleration is constant but still $\langle speed\rangle\not=0$ whereas $\langle velocity \rangle=0$ Now let's .
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Physics homework help speed velocity acceleration This is the first lesson in energy physics and combined. Express-helpline is the most recommended homework answer website. Velocity-time graphs The distance covered in 5 s by a body moving with a velocity of 6 m/s is given by, Distance = velocity x time = 6 x 5 = 30 m If we plot a graph of velocity against time for this case a straight-line parallel to the time axis is obtained (Fig. ).