Hard
Question
At the same instant, two boys throw balls A and B from the window with speeds υ0 and kυ0 respectively, where k is constant. They collide in air at time t. Which of the following options is/are correct.
Options
A.k = 
B.k = 
C.t = 
D.t = 
Solution
d = v0 cosθ2 t = (kv0 cos θ1) t
cosθ2 = k cosθ1
motion of A w.r.t. B in y direction
(h = Vr t) here Vr = (kv0 sinθ1 + v0 sinθ2)
t =
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