In an elevator, a spring clock of time period $T_S$ (mass attached to a spring) and a pendulum clock of time period $T_P$ are kept. If the elevator accelerates upwards

  • A

    $T_S$ well as $T_P$ increases

  • B

    $T_S$ remain same, $T_P$ increases

  • C

    $T_S$ remains same, $T_P$ decreases

  • D

    $T_S$ as well as $T_P$ decreases

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