What is the effect on the current in a wire it
both the voltage across it and its resistance
are doubled?

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

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.