If an object is dropped from a height of h0, it's height h, in meters, after t seconds is given by the equation h=-4.9t^2 +h0. If a ball is dropped from a height of 19.6 meters, how long will it take the ball to hit the ground?

(b) suppose that consolidated power decides to use a level of significance of α = .05, and suppose a random sample of 100 temperature readings is obtained. if the sample mean of the 100 temperature readings is x⎯⎯ = 60.990, test h0 versus ha and determine whether the power plant should be shut down and the cooling system repaired. perform the hypothesis test by using a critical value and a p-value. assume σ = 5. (round your z to 2 decimal places and p-value to 4 decimal places.)