Amarble rolling at a speed of 2 meters per second falls off the end of a 1-meter high table. how long will the
marble be in the air?
a. what do you know?
b. what do you need to solve for?
c. what equation(s) will you use?
d. what is the solution to this problem?

We an assume her that marble is project with horizontal velocity=2
neglect air resistance
it falls a distance 1m
it vertical velocity initially is 0
so 1=1/2gt^2
i take g=10
then we find that t=0.2236 s

 

Are there options for this?

Ohm's law tells you that i = v/r where v is equivalent voltage and r is equivalent resistance of the circuit
since all circuits have the same voltage, your question is really asking which circuit has the lowest total resistance, since the lower the resistance, the higher the current
circuit a has a resistance of 5 ohms; circuit c is in series so has a resistance of 10 ohms; circuit b is in parallel and therefore has a resistance of 2.5 ohms (review your notes on adding resistances in parallel and series); therefore b has the highest current