The displacement (x) variation of a particle with time (t) is given by expression $x = - 15 t^{2} + 20 t + 30$ . What is the velocity at $t = 0$ ?

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-30

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-20

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Solution

The correct option is D 20
$v (t) = d x (t) / d t = - 30 t + 20$
$v (0) = 20$
Therefore, the velocity at $t = 0$ is $20 m / s$ .

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