A7.14 kg bowling ball moves at 1.92 m/s. how fast must a 2.3 g ping pong ball move so that the two balls have the same kinetic energy?

Therefore we can substitute values in:
The kinetic energy of the bowling ball is 

We can now substitute this in for the ping pong ball (note the mass of the ping pong ball is 0.0023kg as Ek is kgm^2s-1):

v=sqrt(11443.87)=106.97m/s
=107m/s To 3sf as the values in the question are given to 3sf.

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.

Pe = 1/2k(x)^2  and .05n/m = .05x10^-9m = x