Question

from certain height, two bodies projected horizontally with velocity 10m/s and 20m/s. they hit the ground in t1 and t2 seconds?
relation between t1 and t2
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Answer 1

Explanation:

let h be the height from which two bodies are projected 

using 2nd equation of motion in y direction:

h=uyt+2gt2

uy=0 for both case

t=g2h

since t is independent of ux

so t1=t2