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If a projectile crosses two walls of equ...

If a projectile crosses two walls of equal height `h` symmetrically as shown in the fig.Choose the correct statement (s) `(g=10m//s^(2))`

A

time of flight is 8s

B

the height of each wall is 60 m

C

the maximum height of projectile is 80 m

D

all the above

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