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Problem

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Textbook Expert
Textbook ExpertVerified Tutor
28 Oct 2021

Given information

There are three motions mentioned in the given question:

1. a rock falling from a cliff,

2. an elevator moving from the second floor to the fifth floor making stops along the way,

3. a dish resting on a table.

Now we have to find out which of these motions is not at constant acceleration.

Step-by-step explanation

Step 1.

 A rock falling from a cliff:

When a rock is falling from a cliff, it is accelerated downwards due to the gravity.

A rock falling from a cliff would have a constant acceleration i.e. the rock falls with the acceleration due to gravity which is constant.
 
But when there is air resistance, then the acceleration will be decreasing as the rock falls.
 
 
If we ignore the air resistance, then this motion is at constant acceleration.

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