An object is propelled vertically to a maximum height of 4R from the surface of a planet of radius R and mass M. The speed of object when it returns to the surface of the planet is.
2√2GM5R
√GM2R
GM5R
√3GM2R
A
2√2GM5R
B
√GM2R
C
GM5R
D
√3GM2R
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Solution
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Using Energy conservation
−GMn5R+0=−GMmR+12mv2 V=2√2GM5R
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