4. A projectile if fired from the top of a cliff of height h above the ocean below. The projectile is fired at and angle ð above the horizontal and with an initial speed vį. (a) Find a symbolic expression in terms of the variables vi, 9, and 0 for the time at which the projectile reaches its maximum height. (b) Using the result of part (a), find an expression for the maximum height hmax above the ocean attained by the projectile in terms of h, vi, g, and 0.

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