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When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart

Scientists follow specific processes in order to determine valid explanations and conclusions from observations. david observed strange lights in the sky above his home outside of roswell, new mexico. the only explanation that makes sense to him is that there are ufos in the area. what should david do next to verify his explanation?

Which system of units is used by only a small number of countries in the world, including the u.s.