In a movie, the heroine saves the day by cutting a wire before the time runs out on a timer. how did she change the circuit? a) she changed a short circuit to an open circuit. b) she changed an open circuit to a closed circuit. c) she changed a closed circuit to an open circuit. d) she changed a closed circuit to a short circuit

C) She changed a closed circuit to an open circuit.

Option (c)

Explanation:

When the current flows through the circuit, then it is called closed circuit.

When the current does not flow through the conductor, then it is called open circuit.

So, she changed the closed circuit to an open circuit.

In open circuit, no current flows through the circuit.

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s

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