Question

Problem 23.74 Near the surface of the Earth there is an electric field of about 150...

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  

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