In Fig. 6-31, water balloons are tossed from the roof of a building, all with the same speed but with different launch angles. Which one has the highest speed when it hits the ground? Ignore air resistance. Explain your answer.
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The launch speed and height of the building are the same. The sum of initial kinetic energy and potential energy of all the balloons is the same at the beginning of the travel and at the end.
All the balloons on the ground will have the same speed because of the law of conservation of energy in isolated frictionless system.