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  4. Find the initial speed of an object of mass 2kg which is fired vertically upward from the surface of earth and reaches up to height equal to radius of earth.

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Q. Find the initial speed of an object of mass $2kg$ which is fired vertically upward from the surface of earth and reaches up to height equal to radius of earth.

NTA AbhyasNTA Abhyas 2020

Solution:

Use $\frac{1}{2}mv^{2}=\frac{m g h}{\left[1 + \frac{h}{R}\right]}$