A69 g particle is moving to the left at 25 m/s . how much net work must be done on the particle to cause it to move to the right at 31 m/s ? express your answer to two significant figures and include the appropriate units.

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?