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Q. If a ball is thrown upwards at 20 ft/sec, the height h after t seconds is given by h = -16t^2 + 20t. How many seconds does it take for the ball to reach its greatest height, and what is this height?

Q. An aluminium wire carrying a current of 2 A has a cross-sectional area of 3.0 10-6 m2. Find the drift speed of the electrons in the wire. The density of aluminium is 2.70g/cm3. (Assume three electrons are supplied by each atom.)

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Category:- Physics
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