Sandra throws an object straight up into the air with an initial velocity of 38 ft/s from a platform that is 30 ft above the ground. Use the formula h(t)=16t^2+v0^t+h0, where v0 is the initial velocity and h0 is the initial height. How long will it take for the object to hit the ground? Responses 1 s 1 s 2 s 2 s 3 s 3 s 4 s 4 s