Consider the following two statements.
A. Kirchhoff's junction law follows from the conservation of charge.
B. Kirchhoff's loop law follows from the conservation of energy.
Which of the following is correct?

Options

A. `sqrt120 m//s`
B. `sqrt105 m//s`
C. `sqrt30 m//s`
D. `sqrt75 m//s`

Answer

B

Explanation

`v_(c )^(2) = v_(B)^(2) + 2g(h_(2) -h _(1)`
`rArr = v_(c ) = sqrt(45^(2) + 2 xx 10 xx 3) = sqrt(105) ms^(-1)`