I'm taking my first basic physics course and I came across this simple question (which I got the wrong answer apparently). The question was this: what is the velocity and acceleration of an object which has reached it's maximum height after being thrown directly upwards?
Well, you don't really need equations for this, unless you want to mathematically prove your answer. In that case:
Acceleration = (Velocity - Initial Velocity) / Time
Time = Distance / Average Velocity
Velocity = Initial Velocity + Acceleration(Time)
Distance = Initial Position + Average Velocity(Time)
These are very basic Kinematic equations.
The Attempt at a Solution
What I answered was that the velocity is 0 (which was correct) and that the acceleration was also 0 (which was incorrect). I went by the test a little too fast and realized my answer was most likely wrong after comparing answers with other students. The mistake I made was assuming that since it was at 0 velocity, there couldn't possibly be any acceleration whatsoever, but I did not take into account that acceleration = gravity. Since gravity is always influencing an object, there must be a rate of acceleration (-9,8 m/s). But my question is how could there possibly be an acceleration for an object which has a velocity of 0?