Question

Two balls are thrown horizontally from the top of a
building with speed u, and un respectively in
opposite directions. The separation between two
balls when they are moving perpendicular to each
other, is (Acceleration due to gravity is g)
​

Answer 1

Answer:

General velocity vector of the projectiles is given by 

V=v1+j(gt)...................(1)

V=v2+j(gt).............(2)

for both the vectors above to be perpendicular ,their dot product must be zero.

hence,dot product is

v1×v2+g2t2=0

finally,

t=gv1v2

⁹

Explanation:

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