- #1

Devin Humphreys

## Homework Statement

A basketball player practices shooting three-pointers from a distance of 7.71 m from the hoop, releasing the ball at a height of 1.93 m above ground. A standard basketball hoop's rim top is 3.05 m above the floor. The player shoots the ball at an angle of 45° with the horizontal. At what initial speed must he shoot to make the basket?

V

_{0}= _______________ m/s

## Homework Equations

The four kinematic equations

Parabolic trajectory equation (simplified since x

_{0}is taken to be 0 to

y = y

_{0}+ ((v

_{y0}/ v

_{x0}) * x) - ((g / (2v

_{x0}

^{2}) * x

^{2})

## The Attempt at a Solution

I know that the way the problem is set up it will take the same amount of time for the basketball to travel 7.71 meters horizontally as to reach the peak of its trajectory then go down to 3.05 meters in the y-direction for a displacement of 1.12 m. I don't know how to get from there to either finding the velocity directly or finding the time. If I can find the time, I can plug it and the y-displacement into the kinematic equation y = y

_{i}* t + (1/2)gt

^{2}to get the initial velocity in the y direction, which I can apply basic trig to in order to find the total velocity. I just don't know how to find the time.