A 0.25 Kg object is projected vertically into the air with a velocity of 45 m/s. How high above the ground is the object after 4.3 seconds? A) 103 m
B) 0 m
C) 87 m
D) 121 m

Lightning is an example of what phenomenon? a release of a large amount of energyan absorption of a large amount of energya natural electric circuita natural electric current

When is a current produced? when the terminals of an electrochemical cell are connected by a wire if the electric circuit is opened in an electrochemical cell if the electrolyte is removed from an electrochemical cell when the electrodes are reversed in an electrochemical cell

Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in