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I used the formula for escape velocity putting the speed of the bullet instead of the escape velocity but I do not think is correct.

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- Thread starter ezio1400
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- #1

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I used the formula for escape velocity putting the speed of the bullet instead of the escape velocity but I do not think is correct.

- #2

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You have to show your work in order for anyone to comment on it.

I used the formula for escape velocity putting the speed of the bullet instead of the escape velocity but I do not think is correct.

- #3

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escape velocity= ((2*G*M

h=7977320+6360*10

- #4

ehild

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You are close to the right track, but why did you use the formula for the escape velocity? It gives the velocity when the kinetic energy is equal to the gravitational potential energy on the Earth surface.

In the problem, the bullet is shot upward with 10 km/s speed from the surface of the Earth, where it has some gravitational potential energy. The total energy KE+PE is conserved, how far is the bullet when its kinetic energy becomes zero?

In the problem, the bullet is shot upward with 10 km/s speed from the surface of the Earth, where it has some gravitational potential energy. The total energy KE+PE is conserved, how far is the bullet when its kinetic energy becomes zero?

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ehild

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But you have learnt about the escape velocity - how was it explained to you without energy?

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The formula for escape velocity was given to me without proof .

- #8

ehild

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Strange.The formula for escape velocity was given to me without proof .

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