Answer:
P = 1.4 Watts
Explanation:
Given that,
Weight of books, W = 10 N
It takes 50 seconds to lift the books to a height of 7m. We need to find the power required. Let the power be P. It can be done as follows :
[tex]P=\dfrac{W}{t}\\\\P=\dfrac{mgh}{t}\\\\P=\dfrac{10\times 7}{50}\\\\P=1.4\ W[/tex]
So, the power required is 1.4 watts.
