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Class 9
Chapter 8 Class 9 - Motion

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Transcript

Example 8.1 An object travels 16 m in 4 s and then another 16 m in 2 s. What is the average speed of the object? We know that Average speed = (π‘‡π‘œπ‘‘π‘Žπ‘™ π‘‘π‘–π‘ π‘‘π‘Žπ‘›π‘π‘’)/(π‘‡π‘œπ‘‘π‘Žπ‘™ π‘‘π‘–π‘šπ‘’) Distance travelled in 4 seconds = 16 m Distance travelled in 2 seconds = 16 m Total distance travelled = 16 + 16 = 32 m Total time taken = 4 + 2 = 6 s Thus, Average speed = (π‘‡π‘œπ‘‘π‘Žπ‘™ π‘‘π‘–π‘ π‘‘π‘Žπ‘›π‘π‘’)/(π‘‡π‘œπ‘‘π‘Žπ‘™ π‘‘π‘–π‘šπ‘’) = 32/6 = 5.33 m/s

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CA Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 12 years and a teacher from the past 16 years. He teaches Science, Economics, Accounting and English at Teachoo