Complete the following statement: The electromotive force is:.a. the force that accelerates electrons through a wire when a battery is connected to it. b. the maximum potential difference between the terminals of a battery. c. the force that accelerates protons through a wire when a battery is connected to it. d. the maximum capacitance between the terminals of a battery. e. the potential difference between the terminals of a battery when the battery is not in use.

Astone is dropped from the upper observation deck of a tower, 250 m above the ground. (assume g = 9.8 m/s2.) (a) find the distance (in meters) of the stone above ground level at time t. h(t) = (b) how long does it take the stone to reach the ground? (round your answer to two decimal places.) s (c) with what velocity does it strike the ground? (round your answer to one decimal place.) m/s (d) if the stone is thrown downward with a speed of 2 m/s, how long does it take to reach the ground? (round your answer to two decimal places.) s