Question

6. What is a distance-time graph? With an example prepare a graph of distance-time and find out the total distance covered
by the body. Draw a table for this graph and draw conclusion, about the type of motion the body undertakes.
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Answer 1

Answer:

The conditions necessary for hearing the echo:

The human ear can not distinguish between two successive sounds if the period between them is less than 0.1 second , Wide and big reflecting surface must be presented to hear the echo such as the walls , the mountains or the water bodies .