A projectile is fired straight up. y"=-GM/((Y+R)^2) -Be^-y y(0)=0 y'(0)=V_0 Compute total amount of time for the projectile to stay in the sky from launch till retouch of the ground. G, M, R, V_0, and B are all constants.
Compute the total amount of time the projectile is in the sky from launch to retouch of the ground, and compute the velocity at the instant when the projectile retouches the ground.
Am i supposed to integrate y" twice to find the position and set y=0 in the position function? how do i integrate the acceleration (which is a function of time) with respect to time?

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