If we use plus and minus signs to indicate the direction of velocity and acceleration in one dimension, in which of the following situation does the object speed up?

Negative velocity and negative acceleration

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Positive velocity and negative acceleration

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Positive velocity and zero acceleration

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Negative velocity and positive acceleration

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none of the above.

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Solution

The correct option is A Negative velocity and negative acceleration
$\to v = \to u + \to a t$

$o r \to v = - \to u - \to a t$

Direction of initial velocity and direction of acceleration should be same, either negative or positive

Hence, at negative velocity and negative acceleration object will speed up

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If we use plus and minus signs to indicate the direction of velocity and acceleration in one dimension, in which of the following situation does the object speed up?

The correct option is A Negative velocity and negative acceleration→v=→u+→at or→v=−→u−→at Direction of initial velocity and direction of acceleration should be same, either negative or positive Hence, at negative velocity and negative acceleration object will speed up