Chemistry, asked by storeofmumbai5679, 9 months ago

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​

Answers

Answered by akibaftabsifmnil
1

Answer:

Answer:40.42 ,is the answer of this question

Answered by SreeragSunil
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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