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Q. What must the charge (sign and magnitude) of a 1.50-g particle be for it to remain stationary when placed in a downward-directed electric field of magnitude 610 ?

Q. Two blocks are connected by a lightweight, flexible cord that passes over a frictionless pulley. If m1 is 3.7 kg and m2 is 9.0 kg, and block 2 is initially at rest 140 cm above the floor, how long does it take block 2 to reach the floor?

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