13) A science student is riding on aflatcar of a train traveling along a straigh

Question

13) A science student is riding on aflatcar of a train traveling along a straight horizontal track at aconstant speed of 9.0 m/s. The student throws a ball along a paththat she judges to make an initial angle of 54.0° with thehorizontal and to be in line with the track. The student'sprofessor, who is standing on the ground nearby, observes theball to rise straight up. How high does the ball rise?
A) 10.6 m B) 2.67 m C) 7.83 m D) 9.80 m 13) A science student is riding on aflatcar of a train traveling along a straight horizontal track at aconstant speed of 9.0 m/s. The student throws a ball along a paththat she judges to make an initial angle of 54.0° with thehorizontal and to be in line with the track. The student'sprofessor, who is standing on the ground nearby, observes theball to rise straight up. How high does the ball rise?
A) 10.6 m B) 2.67 m C) 7.83 m D) 9.80 m

Explanation / Answer

h = (u sin 54o)2/ (2g)    = (9*0.809)2/(2*9.8) = 2.704 m

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