A ball of mass 1.5 kg is initially at rest in a tall tree. The ball initially has a potential energy of 138.9 joules. If the ball is dropped from the tree, how much kinetic energy will it have the instant before it hits the ground? Round your answer to the tenths place.

Charge is distributed along the entire x-axis with uniform density λ. how much work does the electric field of this charge distribution do on an electron that moves along the y-axis from y = a to y = b? (use the following as necessary: a, b, ε0, λ, and q for the charge on an electron.)