Question

Problem 23.74

Near the surface of the Earth there is an electric field of about 150 V/m which points downward. Two identical balls with mass 0.442 kg are dropped from a height of 2.22 m , but one of the balls is positively charged with q1 = 398 μC , and the second is negatively charged with q2=-398 μC .

Part A

Use conservation of energy to determine the difference in the speeds of the two balls when they hit the ground. (Neglect air resistance.)

Express your answer using three significant figures.

v+−v− =

  m/s  

Answer 1