Question

If an object is projected upward with an initial velocity of 129 ft per sec, its height h after t seconds is h = - 1662 + 129t. Find the heightof the object after 4 seconds.The height of the object after 4 seconds is(Simplify your answer.)ft.

Answer 1

given the equation:

h = -16t^2 + 129t

we are to find the height of the object after 4 seconds

in other to get the height of the object after 4 seconds is to substitute 4 into the equation.

that means we replace t by 4 in the equation

so,

h = - 16t^2 + 129t

substituting 4 into the equation

h = -16(4)^2 + 129(4)

h = - 16(16) + 516

h = -256 + 516

h =