Explain how a lever can act as a force multiplier

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The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?

If anyonee has done the momentum lab practical in physics can you give me the answers i am s lostt rnn : (

Ablue car pulls away from a red stop-light just after it has turned green with a constant acceleration of 0.5 m/s 2 . a green car arrives at the position of the stop-light 6.5 s after the light had turned green. if t = 0 when the light turns green, at what time does the green car catch the blue car if the green car maintains the slowest constant speed necessary to catch up to the blue car? answer in units of s.