Question

3 Two rocks launched from height h Two rocks of the same mass m are launched horizontally at the same time from a height h above level ground. Rock A is thrown with twice the speed of rock B, vA = 2vB. Throughout this problem neglect air resistance. 1. How much time will it take rock A to impact the ground? 2. What will the velocity vf of rock A be just before it impacts the ground? (Answer in terms of the the given variables vA, m, h, and/or g. Write the answer as a vector with x^ and y^.) 3. Which rock - if either - will impact the ground first? 4. Suppose instead that the rocks are launched up at angle ? above horizontal (still the same mass and vA = 2vB). Under this condition, which - if either - will impact the ground first?

          3 Two rocks launched from height h
Two rocks of the same mass m are launched horizontally at the same time from a height h above level ground. Rock A is thrown with twice the speed of rock B, vA = 2vB. Throughout this problem neglect air resistance.
1. How much time will it take rock A to impact the ground?
2. What will the velocity vf of rock A be just before it impacts the ground? (Answer in terms of the the given variables vA, m, h, and/or g. Write the answer as a vector with x^ and y^.)
3. Which rock - if either - will impact the ground first?
4. Suppose instead that the rocks are launched up at angle ? above horizontal (still the same mass and vA = 2vB). Under this condition, which - if either - will impact the ground first?

3 Two rocks launched from height h
Two rocks of the same mass m are launched horizontally at the same time from a height h above level ground. Rock A is thrown with twice the speed of rock B, vA = 2vB. Throughout this problem neglect air resistance.
1. How much time will it take rock A to impact the ground?
2. What will the velocity vf of rock A be just before it impacts the ground? (Answer in terms of the the given variables vA, m, h, and/or g. Write the answer as a vector with x^ and y^.)
3. Which rock - if either - will impact the ground first?
4. Suppose instead that the rocks are launched up at angle ? above horizontal (still the same mass and vA = 2vB). Under this condition, which - if either - will impact the ground first?

Added by John C.

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