In the second video lecture there's an example about the pumpkin drop and I'm a little confused. First, where did he get the 5t^2? Is he rounding the constant for acceleration due to gravity? Second, when he says "speed" does he mean velocity? I got a little confused because speed is usually defined as the absolute value of velocity, but he wrote Avg Speed = -20m/s.
I just want to make sure I know what lingo is being used.

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