Power =(work done) / (time to do the work) = 240 J / 120 sec = 2 watts.
The work done by the stick on the hockey puck is equal to the magnitude of the force times the distance covered by the puck:

And the power of the stick is equal to the ratio between the work done and the time taken, therefore
Answer:
A wavelength is a measure of distance between two consecutive crests or trough. So , the unit of wavelength is same as unit of distance. I.e metre
Water is capable of dissolving a variety of different substances, and is attracted to many other different molecules