Question

A. What term is used to donate the change in velocity with time?
B. Give one word which means the same as ‘moving with a negative acceleration.
C. The displacement of a moving object in a given interval of time is zero.
Would the distance travelled by the object also be zero? Give reason for your answer.

Answer 1

We will answer this question by first defining velocity to answer question a. then we will give a proper meaning of retardation to give an answer to question b. And at last with an example we will answer the question c with logical explanation.

Complete step-by-step solution:
We will start answering this question by first knowing what velocity means:
It is the rate at which something moves in a specific direction.
When the velocity of the body changes with time it is called acceleration.
Hence answer a) is Acceleration
Now lets jump to question b:
Now we know what acceleration is, there is a very common term used for negative acceleration .
Do you know what retarding means? It is the act or outcome of delaying something or the extent to which something is slowed or delayed. Hence when a body moves with a negative acceleration we know that it is delayed. Hence the correct answer to question b) is retardation.
Now lets answer question c:
It has been given that the displacement of an already moving object is 0. Let us consider an example to answer this question. Imagine that you are moving on a circular track wearing a running watch( it tells distance and speed covered by a body). When you complete one round your displacement is 0. Now check your watch, do you think your watch will show distance 0? definitely not. Hence distance won’t be 0.

Note: Do not confuse yourself in the last question. Displacement and distance are 2 different concepts. They’re not always zero. Displacement is the net path covered by the body from initial to final, and distance is the measure between them.