Adrainage canal has a cross-section in the shape of a parabola. suppose that thecanal is 10 feet deep and 20 feet wide at thetop. if the water depth in the ditch if 5 feet, how wide is the surface of the water in the ditch?

What is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest

When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?

An object with initial temperature 130 ∘ f is submerged in large tank of water whose temperature is 50 ∘ f . find a formula for f ( t ) , the temperature of the object after t minutes, if the cooling constant is k = − 0.2 . remember newton's law of cooling (the rate of change of temperature with respect to time is equal to k times the difference between the temperature of the object and the surrounding temperature) ! : )