Class 9 NCERT Solutions Motion

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Class 9 NCERT Solutions Motion. The NCERT solutions for Class 9 Science have been made by Science teacher of one of the best CBSE school in India. These NCERT solutions have been made to give detailed answers and expanations of the concepts which can be easily understood by the students. Refer to other links also to download Science NCERT solutions, worksheets, sample papers and test papers. NCERT Science books have been recommended for students of class 9. The books have been very well defined and easy to understand. Download NCERT books and solutions in pdf free from our website.

1. An object has moved through a distance. Can it have zero displacement? If yes, support your answer with an example.

Answer Yes, an object can have zero displacement even when it has moved through a distance. This happens when final position of the object coincides with its initial position. For example, if a person  moves around park and stands on place from where he started then here displacement will be zero.

2. A farmer moves along the boundary of a square field of side 10 m in 40 s. What will be the  magnitude of displacement of the farmer at the end of 2 minutes 20 seconds from his initial position?

Class_9_Motion

Given, Side of the square field= 10m
Therefore, perimeter = 10 m × 4 = 40 m
Farmer moves along the boundary in 40s.
Displacement after 2 m 20 s = 2 × 60 s + 20 s = 140 s =? Since in 40 s farmer moves 40 m
Therefore, in 1s distance covered by farmer = 40 / 40 m = 1m
Therefore, in 140s distance covered by farmer = 1 × 140 m = 140 m. Now, number of rotation to
cover 140 along the boundary= Total Distance / Perimeter
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