If acceleration is constant, is velocity also constant? Nope. The image at the top of this page shows that the object is speeding up every second by a certain rate, so velocity is not a constant value. The question is, can we figure out what the speed is at different intervals of time? Of course we can! Here’s how…
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Since the wrench started out in the person’s hand, the wrench was stationary. So its initial velocity is zero.
How do we know its initial velocity ?