阿摩線上測驗
15. A 2 kg object is launched from the ground with an initial speed of 30 m/s at an angle of 30° above the horizontal. Neglecting air resistance, what is its kinetic energy when it reaches its maximum height?
(A) 0 J
(B) 225 J
(C) 450 J
(D) 675 J
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統計： A(0), B(0), C(0), D(2), E(0) #3840125
統計： A(0), B(0), C(0), D(2), E(0) #3840125
