Marking criteria:

Appropriate formula to calculate P or I^{(1) }_{rms}.Substitution.^{(2) }Formula for P or W containing Δt.^{(3) }Substitution.^{(4) }Final answer: 55 785,12 J.^{(5) }

**Or**

**Option 2**

^{(1)}

^{(2)}

^{(3)}

^{(4)}

^{(5)}

**Or**

**Option 3**

^{(1)}

^{(2)}

^{(3)}

^{(4)}

^{(5)}

**Or**

**Option 4**

**Part 1**

^{(1)}

^{(2)}

**Part 2**

^{(3)}

^{(4)}

^{(5)}

**Or**

^{(3)}

^{(4)}

^{(5)}

**Or**

**Option 5**

^{(1)}

^{(2)}

^{(3)}

^{(4)}

^{(5)}