Question

Stephanie is a very good soccer player. She can kick a soccer ball with an initial velocity of

21.3 m/sec. The function that represents the height of the ball with respect to time is ℎ (x) =
−4.9x^2 + 21.3x. About how many seconds will it take for the ball to hit the ground?

Answer 1

h(x)=−4.9x2+21.3x? we want to know what x is when the ball hits the ground well when the ball hits the ground the height between the ball and the ground is 0 so you want to solve for x when h(x)=0