Question

Class 9 science chapter 8 motion
Answer in one sentence1. Give one example each of positive acceleration and negative acceleration.
2. The distance time graph of a moving object is a straight line inclined to the time axis . What do you conclude about the nature of motion? ​

Answer 1

Answer:

here is the answer

1. a ball falling freely under gravitational force is an example of positive acceleration

and aball going against gravitational force is an example of negative acceleration.

2.if it is a straight line this means that the object is at rest.

hope it helps

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Answer 2

1. Example of positive acceleration - a bus moving with increasing speed

Example of negative acceleration – break applied on a moving bus

2. The moving object has a constant velocity.  

Explanation:  

1. When the velocity of the body increases with time its acceleration is said to be positive if its direction is same as the direction of the body. Hence when a bus is moving with increasing speed its positive acceleration.

Negative acceleration happens when an object moving with certain velocity is brought to rest. Applying break to a moving bus is an example of this.

2. The distance time graph is used to calculate the velocity of a moving object. In this case it is given that the distance time graph is a straight line. This implies that the body in motion has constant velocity.

To learn more:

1. Explain the balance and unbalance force.​:

https://brainly.in/question/16142726?answeringSource=feedPersonal%2FquestionPage%2F9

2. Is the background black or white :

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