Question

Acceleration is greatest when a car starts from rest or brakes are applied on it suddenly

Answer 1

acceleration is greater when car starts from rest as static friction is more than sliding friction.
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Answer 2

when brakes are applied the moving car loses velocity and may even come to rest . So in this case the acceleration is negative .Hence , acceleration of case of a car starting from rest in move than the acceleration of a car applying the break suddenly.

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