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A ball is projecte with a velocity `20 ms^-1` at an angle to the horizontal. In order to have the maximum range. Its velocity at the highest position must be
A. `10 ms^-1`
B. `14ms^-1`
C. `18ms^-1`
D. `16ms^-1`

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Correct Answer - B
At `45^@` , range is maximum. At highest point, it has only horizontal component of velocity or `20cos45^@ = 14 m//s` .

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