Answer:
The work done by gravity moving the box up is -514.5 Joules.
Explanation:
The gravity acts in the direction of the displacement, which in this case is negative (ground - top shelf), and so the resulting work is negative. The work is calculated as:

The work done by gravity moving the box up is -514.5 Joules.
E = I R
Voltage = (current)×(resistance).
V = 5A x 5 ohms = 25 volts.
Answer:
B. 2. A baseball was hit by a bat and now flying through the air.
Explanation: A baseball that is hit by a bat has a larger velocity, due to this the amount of kinetic energy is high.