Q70 A body is projected away from Earth surface with a speed thrice its escape velocity. What will be speed of body at infinity if its escape velocity is 15 km/sec?Ops: A. 40.42 km/secB. 42.42 km/secC. 32.33 km/secD. O 31.45 km/sec
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Answered by
1
Answer:
Answer:40.42 ,is the answer of this question
Answered by
0
Answer:
We can use the concept of conservation of energy in this problem.
You know that at infinity, Gravitational potential energy is assumed to be zero.
Also, total energy of projection from Earth = total energy of body at infinity.
1/2mve^2 + -GMm/R = 1/2mv^2
Putting the necessary values,
we get v at infinity = √8 * ve=2√2 × 15km/s = 42.42km/s. So option B is correct
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