1i dont know that , i'm not able to understand the question itself!!
Aperfectly elastic particle is projected with a velocity V in a vertical plane through the line of greatest slope of an inclined plane of elevation θ . If after striking plane the particle rebounds vertically,
show that it will return to the point of projection at the end of time equal to
6 V/ √(1+ 8sin2 θ )
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4 Answers
1
9Q isnt clear to me at all
else its a easy problem involving manipulation only