Near the surface of the moon, the distance that an object falls is a function of time. it is given by d(t) = 2.6667t2, where t is in seconds and d(t) is in feet. if an object is dropped from a certain height, find the average speed of the object from t = 1 to t = 4. (round your answer to the nearest whole number.)

averaage speed  is  v = 13 feet / s

Explanation:

 The average speed is the ratio of the distance traveled in a given time interval, let's calculate the distance that the body travels in the two instants of time that give us

 t = 1 s

       d (1) = 2.6667 1²

       d (1) = 2.6667 feet

 t = 4 s

       d (4) = 2.6667 4²

       d (4) = 42.6672 feet

Let's calculate the speed

       v = Δx / Δt

       v = (42.6672 -2.6667) / (4-1)

       v = 40/3

        v = 13.33335 feet / s

        v = 13 feet / s

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle

more than, less

less than, more