Question

A ball is thrown upward from the ground with an initial speed of 25 m/s; at the same instant, a ball is dropped from rest from a building 15 meters high. After how long will the ball be at the same height?

Answer 1

\[x = x_0 + v_0\Delta t + 1/2(at^2)\]

subscript 0 means at t = 0 (initial value)
a is aceleration and it is 9.8 m/s^2

Answer 2

acceleration*