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Direction of velocity and acceleration

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Is it possible that the velocity and the acceleration of a body point in opposite directions? if yes then why?
if no then why?

Answer:

Yes. It is possible for the direction of acceleration to be opposite to the direction of velocity.

Acceleration is the rate of change of velocity. If velocity is increasing while moving in a straight line then the direction of acceleration is same as the direction of velocity.

Oscillating pendulum, showing acceleration and...
Oscillating pendulum, showing acceleration and velocity. Português: Pêndulo oscilante, com indicação da aceleração e da velocidade. Español: Pendulo oscilador, mostrando la aceleración y la velocidad. (Photo credit: Wikipedia)

It the velocity is decreasing whil travelling in a straight line then the direction of acceleration is opposite to the direction of velocity.

Example: When a stone is thrown vertically upwardsm its acceleration is downwards and velocity is upwards.

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