28 Oct 2021
Problem 15
Page 41
Section: Questions
Chapter 2: Describing motion: Kinematics in one dimension
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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