Question

An elevator is moving upwards at a steady speed. Give the signs for the velocity and the acceleration of the elevator. Write the correct sign for the elevator's velocity and the correct sign for the elevator's acceleration, separated by a comma. For example, if you think that the velocity is positive and the acceleration is negative, then you would enter ,- . If you think that both are zero, then you would enter 0,0 .

Answer 1

Answer:

Explanation:

Velocity is always relative and reference frames are arbitrary.

Relative to a ground based observer with UP as his positive reference frame, velocity would be positive and acceleration would be zero as velocity is not changing. This person would write (+, 0)

For a ground based observer who chooses DOWN as the positive direction, This person would write (-, 0)

relative to a rider inside the elevator car, no sensation of motion or acceleration would be detectible (if no windows and a smooth ride). This person would write (0, 0)

Because problem writers are often not very imaginative, my GUESS is that the desired answer is the first option, which I have highlighted.