A child throws three identical marbles from the same height above the ground so that they land on the flat roof of a building. The marbles are launched with the same initial speed. The first marble, marble A, is thrown at an angle of 75° above horizontal, while marbles B and C are thrown with launch angles of 60° and 45°, respectively. Neglecting air resistance, rank the marbles according to the speeds with which they hit the roof.
a) A
b) C
c) A and C have the same speed B has a lower speed
d) B has the highest speed; Aand C have the same speed.
e) A, B, and C all hit the roof with the same speed.
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