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Point A is at position (4j -3k)cm. Point B is at position -3cm k. Point C is at position (3i -2j + 5k) cm. Point D is at position 4cm j.Charges of -4 and +5uC are at A and B respectively. What is the electric potential energy of an electron at D?
e= 1.6x10^-19C and k=9x10^9N m^2/C^2
Two masses of 27 kg and 18 kg are suspended by a pulley that has a radius of 12 cm and a mass of 9 kg, Determine the speeds of the two masses as they pass each other
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A suitcase falls out of an airplane which is 400 meters above the ground. What is the time it takes for the suitcase to reach the ground
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