The ball has joules of potential energy at point b. at position a all of the energy changes to kinetic energy. the velocity of the ball at position a is meters/seconds. assume theres no air resistance. use g=9.8m/s2

As I don’t see unit values we can do this with algebra gravitational potential energy is equal to mgh so you find that and then convert it to 1/2mv^2

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.

Ithink they do have the same properties just in less quantities i think