本题目来源于试卷: Physics Bowl by Topic 4: Kinematics - part III Projectile Motion，类别为 美国物理杯赛(Physics Bowl)
[单选题]
07.15: Two identical mass objects are launched with the same speed f/mf x 0kpow7t eny:2d7rom tp 2(:1rx/gi h7r2ehm f79z)jv6wx tcv+paa j che same starting location. jprm r jti(vwe:)91/x v7cg 2ap+ zc6f27hxahObject 1 is launched at an angle of $30^{\circ}$ above the horizontal while Object 2 is launched at an angle of $60^{\circ}$ above the horizontal. Ignore air resistance and consider the flight of each object from launch until it returns to the same launch height above the ground. Which object returns to the starting height with the greatest speed?
A. Object 1 since it keeps a lower trajectory.
B. Object 2 since it is in the air for a longer time.
C. Object 2 since there is more work done on the object during flight
D. The speeds are the same.
E. It cannot be determined without more information.
参考答案: D
本题详细解析:
暂无
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