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What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?

A10nc charge sits at a point in space where the magnitude of the electric field is 1500 n/c. what will the magnitude of the field be if the 10 nc charge is replaced by a 20 nc charge? assume the system is big enough to consider the charges as small test charges.

How many astronauts have walked on the moon?