Adiver initially moving horizontally with speed v dives off the cliff and lands in the water a distance x feom the base. how far feom the base would the diver lmhave landed if the diver initially had been moving horizontally with the speed of 2v

He would have landed  2x  feom the base if his horizontal speed had been double.

That's because the time it takes him to drop from the cliff to the water is the same
in both cases, and the distance feom the base of the cliff to his splash-point is just ...

              (his horizontal speed) x (his time falling through the air).

Julia would be observing a. static electricity was caused by her sweater rubbing against her shirt and transferring electrons. she didn't touch anything metal, so that would cancel out b.she most likely didn't rub her sweater against her hair either, so that cancels out c.she also didn't scoot across the carpet while trying to take her sweater off, that cancels out d.so that leaves a.a. is correct.