Scored out of. 30 Points 215 Exam #3-Conceptual Exam IExit this Exa Time limit 5

Question

Scored out of. 30 Points 215 Exam #3-Conceptual Exam IExit this Exa Time limit 50 minutes Length 15 questions Conceptual in Exams Exam- Conceptual Pages Time Remaining 34 Part 4 11) A girl throws a stone from a bridge. Consider the following ways she might throw the stone. The speed of the stone as it leaves her hand is the same in each case. Case A: Thrown straight up Case B: Thrown straight down. Case C: Thrown out at an angle of 45 above horizontal. Case D: Thrown straight out horizontally In which case will the speed of the stone be greatest when it hits the water below? Select 1X2pts) Case A Case B Case C Case D O All the same None of the above Previous 6 718 9/10/11 12) 13114/15 3

Explanation / Answer

The correct option is All the same.

Given that the initial speed and the position of throwing the ball in each of the cases are same, the initial total energy (KE) is same. As the final position of all the cases is same, the change in position of the source and the destination is same. Then the total energy (KE+PE) is same. As the final positions are the same, the PE will be same and this leads to the same KE for the ball in all the case. Hence, the ball has same speed irrespective of their direction of throw.

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