A ball is thrown from an initial height of 7 feet with an initial upward velocity of 30ft/s. The ball's height h (in feet) after t seconds is given by the following. h=7+30t-16t^2

Find all values of t for which the ball's height is 20 feet.

Round your answer (s) to the nearest hundredth.

t = - - seconds

Question

Emely Proctor

Mathematics

2 April, 06:45

A ball is thrown from an initial height of 7 feet with an initial upward velocity of 30ft/s. The ball's height h (in feet) after t seconds is given by the following. h=7+30t-16t^2

Find all values of t for which the ball's height is 20 feet.

Round your answer (s) to the nearest hundredth.

t = - - seconds

+3

Answers (1)

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Swanson · Answer 1

This is a parabola. 20 ft represents the height of the ball. Height is represented by the letter h. Thus you need to plug 20 into the equation for h and solve for t.