Projectiles: Other https://www.youtube.com/watch?v=lkwh4ZaxHIA
Calculate the time it takes the rock to strike the ground. What are the magnitude and direction of the velocity at impact?
X Y x= y= -20 xo= 0 yo= 0 vx= 25cos35 vy= vxo= 25cos35 vyo= 25sin35 ax =0 ay = -9.8 t =
Part (a) Method 1: Quadratic To solve for t use the quadratic formula
Other ways to solve quadratic: Graphically (graphing calculator) Or use solver program in graphing calculator
Part (a) Method 2: Without Quadratic Solve for ymax
Solve for time to ymax Rock falls a distance of ymax+20 from the highest point. Solve for time as a horizontally launched problem
Part (a) Method 3: Without Quadratic
(vx is positive, vy is negative) Part (b) Magnitude Direction Below +x (vx is positive, vy is negative)