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I just need some help with intepreting this question. Ive allready solved the first part (A), but im not sure as to when the time t1 occurs. Heres the question:

(A) A particle is progected with speed u at an angle alpha to the horizontal. If the maximum height reached is the same as the total horizontal range, show that tan alpha = 4

(B) The particle moves at right angles to its original direction of motion after a time t1 and then strikes the horizontal plane after 8s, both times measured from the instant of projection.

Show u = g(root)17

Calculate t1

Ok, so ive shown tan alpha = 4 and u = g(root)17, but i dont know when t1 occurs. Is it when the maximum vertical height is achieved? Any help is appreciated.

Thanks in advance

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# Homework Help: How to interpret this projectile motion problem

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