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A newton is the amount of work it takes to push one kilogram 1 meter per second... Two newtons would accelerate the object from 0 m/s to 2 m/s..

Would an object traveling at 5 m/s require an additional 1 N to accelerate it to 6 m/s? I thought it would require more and more energy (or Newtons) to push an already moving object even faster - more than just 1 N. I can't quite understand the difference between a joule and a newton. I can see how the mass is square in the formula for a joule, but can't understand why. Can anyone help me with this?

Thanks.