Which of these inventions is oldest? ........................................................

The telephone

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The telescope

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The wheel

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The helicopter

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Solution

The correct option is C The wheel
'The wheel' is the oldest invention amongst the given inventions.

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A helicopter is flying at a height of 1500 m. There is a helipad which is just below the helicopter at a height of 600 m from the ground. Taking upward movement of the helicopter as positive and downward movement as negative. Find the distance of helipad from the helicopter? How much time will it take for the helicopter to reach the helipad if the speed of the helicopter is 50 meters per second?
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Q. A helicopter is flying at a height of 1500 m. There is a helipad which is just below the helicopter at a height of 600 m from the ground. Taking upward movement of the helicopter as positive and downward movement as negative. Find the distance of helipad from the helicopter?

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Which of these inventions is oldest? ........................................................

The correct option is C The wheel'The wheel' is the oldest invention amongst the given inventions.

The correct option is C The wheel
'The wheel' is the oldest invention amongst the given inventions.