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A ball is launched directly in the air at a speed of 60 feet per second from a platform located 20 feet in the air

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A ball is launched directly in the air at a speed of 60 feet per second from a platform located 20 feet in the air. The motion of the ball can be modeled using the function f(t)=−16t+60t+20, where t is the time in seconds and f(t)

 is the height of the ball. After approximately how much time, in seconds, will the ball hit the ground?