Question

please explain the 2nd question.

Answer 1

hlo bro its simple
initial velocity= u
final velocitiy=v=0
v will be zero at greatest height
using 3rd equation of motion
v^2-u^2=-2gh

(0)^2-u^2=-2gh

u^2=2gh

h=u^2/2g

hope it helps u

Answer 2

Explanation:

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