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Q. A player puches a 250-g hockey puck over frictionless ice with a constant force, causing it to accelerate at 24 m/s^2 over a distance of 50 cm. Find the work done by the hockey player on the puck. What is the change in kinetic energy of the puck.

Q. A small but measurable current of 2.11 mA exists in a solid cylindrical wire whose diameter is 0.08 mm. Calculate the magnitude of the current density in the wire.

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