What are the average velocity and average acceleration of the tip of the 2.4-cm-long hour hand of a clock in the interval from 12p.m. to 6p.m.
I'm given the displacement which is 4.8 cm.
I know the motion takes six hours
I set my x axis at three-o-clock and my y-axis at 12
Average velocity = displacement / change in time
Average acceleration = change in velocity / change in time
The Attempt at a Solution
The answer I get for velocity agrees with the back of the book:
Avg Velocity = -0.8 j cm/hr
But I have no clue how they get an average acceleration of -0.42 i cm/hr2.
I don't understand why there would be an average acceleration if the hand moves at a constant speed. I understand that a change in direction changes acceleration, but I'm missing something.