KinematicsHard
Question
A ball is thrown upward at an angle of 30o with the horizontal and lands on the top edge of a building that is 20 m away. The top edge is 5m above the throwing point. The initial speed of the ball in metre/second is (take g = 10 m/s2) :
Options
A.u = 40
m/s
m/sB.u = 40
m/s
m/sC.u = 40
m/s
m/sD.u = 40
m/s
m/sSolution
y = x tanθ −
g 
5 = 20 tan 30o −
⇒ u2 =
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