Two Balls Thrown from Cliff: Speed of Impact

[naveed4394]

two balls are thrown with equal speeds from the top of a cliff of height H. one ball is thrown upward at an angle @ above the horizontal. the other ball is thrown downward at an angle # below the horizontal. show that each ball strikes the ground with same speed and find that speed in terms of H and the initial velocity v'.



hope that some one will solve this problem for me . with gratitude

 

[tiny-tim]

Welcome to PF!

two balls are thrown with equal speeds from the top of a cliff of height H. one ball is thrown upward at an angle @ above the horizontal. the other ball is thrown downward at an angle # below the horizontal. show that each ball strikes the ground with same speed and find that speed in terms of H and the initial velocity v'. some one will solve this problem for me . with gratitude

Hi naveed4394! Welcome to PF!

Hint: use conservation of … something!