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A man starts from rest at a point A(1;2;-3) |
Answer» ANSWER:◆ Answer - (d) |AB| = 8.5 m ● Explaination - Let i, j & k be unit vectors along X-axis, Y-axis & Z-axis. A = i + 2j - 3K B = 3i + 4J + 5k Displacement of the man is calculated by - AB = B - A AB = (3i + 4j + 5k) - ( i + 2j - 3k) AB = 2i + 2j + 8k Magnitude of displacement is calculated by - |AB| = √(2² + 2² + 8²) |AB| = √(4 + 4 + 64) |AB| = √(72) |AB| = 2√18 |AB| = 8.48 m From the options, 8.5 m is the most appropriate. |
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