Grandpa gave Ravi a detective story book because he knew Ravi had followed him secretly. His advice about avoiding being fooled while trailing a suspect suggests that he was aware of Ravi’s actions.
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Grandpa’s habit of giving gifts shows his generous and caring nature. He considered his family his “babies” and found happiness in making them feel loved, rather than expecting gifts for himself.
Ravi felt great relief and affection on finding Grandpa safe at home. He knelt beside him, lovingly touched his face and hugged him, showing his deep care, concern and attachment.
No, Ravi’s mother probably will not know what happened. Grandpa deliberately told her that he had a quiet morning, while Ravi remained confused and embarrassed. Ravi also chose not to reveal the truth.
The minute hand completes 1.5 revolutions in 90 minutes. Distance = 1.5 × 2π × 7 = 21π cm. Displacement = 14 cm. Average speed = 21π/5400 cm s⁻¹ and average velocity = 14/5400 cm s⁻¹ downward.