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A small mass is suspended by a string from the ceiling of a car. As the car accelerates at ‘a’ the string makes an angle $θ$ with the vertical. Then the tension in the string

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$m \sqrt{a^{2} + g^{2}}$

$m g \cos θ$

$m a \sin θ$

$m a \sqrt{a^{2} + g^{2}}$

answer is C.

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Detailed Solution

$T = \sqrt{{(m a)}^{2} + {(m g)}^{2}} = m \sqrt{g^{2} + a^{2}}$

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