Gravity on a lonely planet

Astronauts on an atmosphere-less planet wanted to find the acceleration due to gravity. In order to find it, they launched a ball from the surface of the planet, with a velocity of 15 m/s,15\text{ m/s}, and predicted that the ball would reach a height of s=15t12gpt2s=15t-\dfrac 12 g_pt^2 meters tt seconds after the launch. If the ball reached the maximum height after 2020 seconds, what was the value of gp?g_p?


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