A bob is hanging over a pulley inside a car through a string . The second end of the string is i...

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A bob is hanging over a pulley inside a car through a string . The second end of the string is in the hand of a person standing in the car. The car is moving with constant acceleration \( a \) directed horizontally as shown in figure . Other end of the string is pulled with constant acceleration \( a \) (relative to car) vertically. The tension in the string is equal to
(a) \( m \sqrt{g^{2}+a^{2}} \)
(b) \( m \sqrt{g^{2}+a^{2}}-m a \)
(c) \( m \sqrt{g^{2}+a^{2}}+m a \)
(d) \( m(g+a) \)
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