The mechanical energy in the falling water is used to spin the generator, and gets transformed into electrical energy. That's the first choice on the list.
Answer:
Θ
Θ
Θ = 
Explanation:
Applying the law of conservation of momentum, we have:
Δ

Θ (Equation 1)
Δ

Θ (Equation 2)
From Equation 1:
Θ
From Equation 2:
sinΘ = 

Replacing Equation 3 in Equation 4:


Θ (Equation 5)
And we found Θ from the Equation 5:
tanΘ=
Θ=
Answer:
Principle of conservation of linear momentum is state as provided no external force acts on a system of colliding bodies the total linear momentum of the bodies (in a given direction) remains constant
By equation of motion :

Now, it is given that it stops after 5 seconds of motion and time at that point is 12:00.
So, time when it started is 11 : 59 : 55.
Therefore, distance travelled is 10 m.
Hence, this is the required solution.