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A small rubber ball is launched by a compressed-air cannon from ground level with an initial speed of 18.9 m/s directly upward. Choose upward as the positive direction in your analysis.
(a) How long does it take to reach the maximum height?
s
(b) How long does it take to reach the ground after it reaches its highest point?
(c) What is its velocity just before it hits the ground? (Indicate the direction with the sign of your answer.)
m/s
Find the electric field strength from the wire. How long is each spring when hanging as shown.
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A steel washer is suspended inside an empty shipping crate from a light string attached to the top of the crate, What is the coefficient of kinetic friction between the ramp and the crate
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