While running these tests, crall notices a similarity in the velocity measured at the ground independent of whether the tennis b

Question

3 months ago

8

While running these tests, crall notices a similarity in the velocity measured at the ground independent of whether the tennis b

all is thrown upward or downward. she decides to see if her hypothesis that the final speed is independent of the sign of the initial velocity is correct. crall and whipple decide to run the experiment several times using different initial speeds of the elevator each time comparing the final velocity of the tennis ball when the elevator is traveling upward vs. downward at the same speed?

Physics

2 answers:

kicyunya [3.2K] · Answer 1 · 2026-03-10T04:17:37+03:00

When the ball reaches the ground, it will consistently possess velocity directed along the force of gravity. Assuming upward motion is classified as positive, then it will always have a negative velocity upon hitting the ground because if it was initially thrown upwards, gravity will reduce its speed, resulting in a negative terminal velocity. Conversely, if it begins falling with an initial downward velocity, gravity will further accelerate the ball in that same downward direction, retaining a negative velocity. However, the final magnitude will differ in each scenario. The ball will achieve a higher final speed upon impact if the elevator descends.

Keith_Richards [3.2K] · Answer 2 · 2026-03-10T04:21:09+03:00

Answer:

The final speeds will vary.

Explanation:

Rationalizing the situation:

Downward motion experiences similar dynamics due to gravitational influences. In a vacuum, an object's terminal velocity remains consistent.

When projecting the ball downward, potential energy transforms into kinetic energy. However, launching it upwards demands more energy to counteract gravity's force. Consequently, the resulting speeds of the ball differ.