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Question

A ball whose kinetic energy is E, is projected at an angle of 45 to the horizontal. The kinetic energy of the ball at the highest point of its flight will be


A
E
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B
E2
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C
E2
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D
Zero
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Solution

The correct option is C E2
At highest point,
ux=u cos θux=u2KE=12mu2x=12mu22=12(12mu2)=E2

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