If the velocity of a bicycle rider decreases from 37.0 mi/h to 7.0 mi/h in 5.0 min, his average acceleration is
a) -6.0 mi/h/min
b) -8.3 mi/h/min
c) 1.7 mi/h/min
d) -6.7 mi/h/min
a
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Conservation of charge means that
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