Arollercoaster starts from rest at the top of a 32m hill. assuming a frictionless track, what will be the speed of the coaster when it reaches the top of the 16 meter tall loop? round to one decimal place and include units. use g=9.8m/s^2 for the acceleration of gravity.

Positrons are spontaneously emitted from the nuclei of

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Place several e-field sensors at a few points on different equipotential lines, and look at the relationship between the electric field and the equipotential lines. which statement is true? 1-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of higher voltages. 2-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of lower voltages. 3-at any point, the electric field is parallel to the equipotential line at that point.