Is the earth flat or round or a donut?

The slope of a velocity time graph over any interval of time gives the during that interval

You throw a small rock straight up from the edge of a highway bridge that crosses a river. the rock passes you on its way down, 7.00 s after it was thrown. what is the speed of the rock just before it reaches the water 28.0 m below the point where the rock left your hand? ignore air resistance.

Current from a charged capacitor lights a bulb. as time goes on the brightness of the