Answer:
39.240 W
Explanation:
Let's start by calculating the work done by the engine. We can assume that it is the same work done by the weight of the object to bring it from 40m to the surface: as much energy it takes to bring it up, the same ammount it takes to bring it down. Said work is 
At this point we can simply apply the definition of power, that is
, to get the power of the engine is 
5 second fall starting at 0 m/s
ball strikes ground at a speed = 49 meters per second.
Solar cells are used to trap sunlight energy (light energy) and convert it to electric energy for domestic and other purposes.