In the circuit diagram, what does the symbol made of two long lines and two short lines with a positive and a negative sign at each end represents? a) a source of electrical energy b) an electrical conductor c) an electrical resistor d) a closed switch asap. will give brainlist and 20 points

During a medieval siege of a castle, the attacking army uses a trebuchet to hurl heavy stones at the castle walls. if the trebuchet launches the stones with a velocity of at an angle of 50.0°, (a) how long does it take the stone to hit the ground? (b) what is the maximum distance that the trebuchet can be from the castle wall to be in range? (c) how high will the stones go? show all your work.