An object is thrown horizontally off a cliff with an initial velocity of 5.0 meters per second. the object strikes the ground 3.0 seconds later. how far from the base of the cliff

You know that the formula for finding horizontal displacement is; 

s=uₓt 
s=(5 m/s)(3s) 
s=15 m

Therefore, the ball travelled 15 m. 

Hope I helped :) 

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.