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Q.

Maximum height reached by a rocket fired with a speed equal to 50% of the escape velocity from  earth’s surface is:

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a

R/3

b

16R/g

c

R/8

d

R/2

answer is C.

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Detailed Solution

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Escape velocity causes KE of  GMmR . Half of such speed causes KE of GMm4R . Conserving total energy, 

 

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