1.An object is released, 50m above the ground, from a hot air balloon, which is descending vertically at a
speed of 4.0m/s^2.
Calculate:
a. The velocity of the object at the ground
b. The duration of descent of the object
c. The height of the balloon above the ground when
the object hits the ground.

B. the duration of descent of the object.

answer: option c. i.e. electric current flowing “downhill” from the negative electrode to the positive electrode in a battery

explanation:

the water analogy to the circuits define the pipes (water flows) to the electric current. now, we know that the electric current flows from the positive terminal to the circuit (as shown in the diagram attached).

hence, option c is the correct answer.