question below

Question

Janet jumps off a high diving platform with a horizontal velocity of 2.64 m/s and lands in the water 2.8 s later. How high is the platform? The acceleration of gravity is 9.8^2 m/s. Answer in units of m

Answer 1

no vertical velocity so:

height of the platform = h = 0.5gt²

= 0.5(9.8)(2.8)² = 38.42 m