A ball is projected with kinetic energy E, at an angle of 60° to the horizontal. The kinetic energy of this ball at the highest point of its flight will become:
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Question

A ball is projected with kinetic energy E, at an angle of 60° to the horizontal. The kinetic energy of this ball at the highest point of its flight will become:

G1 Physics · Accepted Answer

At the highest point only the horizontal component ucos60° remains. Since initial kinetic energy E = ½ μ \mu μ ², the kinetic energy at the top is ½m(u cos60°)² = E cos²60° = E/4. Hence option C.