Current will be

now just pluf in the values and Voila..
The answer is C. Hope this helps.
Answer:
The work done on the box is 80 J.
Explanation:
Given that,
Weight of box = 40 N
Distance = 2 meter
We need to calculate the work done
Using formula of work done


Where, x = distance
mg = weight
Put the value into the formula



Hence, The work done on the box is 80 J.
The wave-particle dual nature of light has been documented and tested many times.
Choice A