An object of mass 10 kg is dropped from a tower of height 150 m. The body strikes the ground with velocity
40 ms–1. Calculate work done by air friction. [Take g = 10 m/s2
]
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An ecosystem is a geographic area where plants, animals, and other organisms, as well as weather and landscape, work together to form a bubble of life. Ecosystems contain biotic or living, parts, as well as abiotic factors, or nonliving parts. ... Ecosystems can be very large or very small.
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