1. Projectiles: Other

2. Calculate the time it takes the rock to strike the ground.
What are the magnitude and direction of the velocity at impact?

3. X Y x=
y= -20
xo= 0
yo= 0
vx= 25cos35
vy=
vxo= 25cos35
vyo= 25sin35
ax =0
ay = -9.8
t =

4. Part (a) Method 1: Quadratic
To solve for t use the quadratic formula

5. Other ways to solve quadratic:
Graphically (graphing calculator)
Or use solver program in graphing calculator

6. Part (a) Method 2: Without Quadratic
Solve for ymax

7. Solve for time to ymax
Rock falls a distance of ymax+20 from the highest point. Solve for time as a horizontally launched problem

8. Part (a) Method 3: Without Quadratic

9. (vx is positive, vy is negative)
Part (b)
Magnitude
Direction
Below +x
(vx is positive, vy is negative)