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The childern are trying to shoot a marble into a marble into a small box using a spring loaded gun that fixed on a table and shoots horizontally from the edge of the table. The centre of the box is a horizontal distance `5m` from the edge of the table. The first child compresses the spring a distance `2cm` and finds that the marble falls short of its target by a horizontal distance `3m`. By what distance `x` should the second child compress the spring to score a direct hit on the box? A. `15cm`B. `10cm`C. `4cm`D. `5cm` |
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Answer» Correct Answer - D `(1)/(2)m u^(2)=(1)/(2)kx^(2)rArrupropx` `R=usqrt((2h)/(g))propupropxrArr(2)/(5)=(2)/(x)rArrx=5cm` |
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