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1.What is the acceleration of a projectile when instantaneous vertical velocity is zero at the top of its trajectory?

  • Physics -

    The acceleration is always -g, in the downward direction if distance is measured positive upwards.

  • Physics -

    it depends... when you talk about acceleration of object going downward, its -g... when acceleration going up, example an object is thrown, i think its 0.

    ax=o; ay= -g

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