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Question

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?

A
Negative velocity and negative acceleration
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B
Positive velocity and negative acceleration
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C
Positive velocity and zero acceleration
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D
Negative velocity and positive acceleration
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E
none of the above.
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Solution

The correct option is A Negative velocity and negative acceleration

v=u+at

orv=uat

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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