Question

If an object is projected upward with an initial velocity of 129 ft per​ sec, its height h after t seconds is h equals negative 16 t squared plus 129 t. Find the height of the object after 5 seconds.

Answer 1

245 feet

Explanation:

Put 5 where t is in the expression and do the arithmetic.

h = -16t^2 +129t

h = -16(5^2) +129·5 = -400 +645 = 245

The height of the object after 5 seconds is 245 feet.