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प्रश्न
Suggest a suitable physical situation for the following graph:
उत्तर
The (u-t) graph indicates that with time, the velocity repeatedly reverses direction while experiencing a decrease in magnitude after each reversal. This coulde represent a physical situation where a ball, initially thrown upwards and then subject to free fall, impacts the ground, rebounding each time with diminishing speed following each contact with the ground.
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संबंधित प्रश्न
A woman starts from her home at 9.00 am, walks with a speed of 5 km h–1 on a straight road up to her office 2.5 km away, stays at the office up to 5.00 pm, and returns home by an auto with a speed of 25 km h–1. Choose suitable scales and plot the x-t graph of her motion.
A jet airplane travelling at the speed of 500 km h–1 ejects its products of combustion at the speed of 1500 km h–1 relative to the jet plane. What is the speed of the latter with respect to an observer on ground?
A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km h –1. Finding the market closed, he instantly turns and walks back home with a speed of 7.5 km h–1.
- What is the magnitude of average velocity, and
- average speed of the man over the interval of time
- 0 to 30 min,
- 0 to 50 min,
- 0 to 40 min?
[Note: You will appreciate from this exercise why it is better to define average speed as total path length divided by time, and not as magnitude of average velocity. You would not like to tell the tired man on his return home that his average speed was zero!]
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