Lilly is playing catch with her younger brother. Her brother goes in to get a drink, leaving Lilly in the backyard. She tosses the ball straight up as hard as she can possibly throw. Which of the following correctly describes the forces acting on the ball after it has left Lilly’s hand?

A
The force from Lilly’s hand decreases as the ball goes up to its maximum height, then the force of gravity causes the ball to fall back to the ground.

B
The force from Lilly’s hand decreases as the force of gravity increases until the ball stops and begins to fall as the force of gravity increases until the ball hits the ground.

C
The only force acting on the ball is the force of gravity. Once the ball leaves Lilly’s hand, it rises to a peak height where the ball begins to fall back to the ground.

D
The only force acting on the ball after Lilly throws the ball up is the force from her hand. The ball rises to a peak height, then the gravitational force causes the ball to fall back to the ground.

Find the vertex(use the completing the square method), findthe x- and y-intercepts, and sketch the graph offunction. y = 2x2 + 4x - 1

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