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show that there are two values of time for which the projectile is at the same height. also , shiow mathematicallythat the sum of these two times is equal to the time of flight.

anirban deb , 11 Years ago
Grade 11
anser 2 Answers
Arun Kumar

Last Activity: 11 Years ago

Hello Student,
initially v=vcos\theta i+vsin\theta j
so to be at height h
we set up this eq
h=vsin\thetat-1/2at^2
whose sum of roots is -b/c=2vsin\theta/g
which is the time of flight
so if when going up height h time is t
then on coming down t’=Time of flight -t
Thanks & Regards
Arun Kumar
Btech, IIT Delhi
Askiitians Faculty
Sumit Majumdar

Last Activity: 11 Years ago

68-965_Sol.JPG
Regards
Sumit
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