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Aball has an initial velocity of 3 m/s. if there is no friction, what is the highest it could roll?

Point charges q1 = 51 µc and q2 = −27 µc are placed 1.0 m apart, with q2 on the right. what is the force (in n) on a third charge q3 = 19 µc placed midway between q1 and q2? (assume the positive direction is to the right. indicate the direction with the sign of your answer.)

Which is a substance that can be separated by physical means and is not the same throughout