Aball is thrown directly upward from a height of 3 ft with an initial velocity of 28 ft/sec. the function s(t)equalsminus16tsquaredplus28tplu s3 gives the height of the ball, in feet, t seconds after it has been thrown. determine the time at which the ball reaches its maximum height and find the maximum height.

Explanation:

Position of the ball as a function of time is given as

now we know that when ball will attain maximum height then the differentiation of the position with respect to time will become zero

so we have

now the maximum height is given as

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.