Projectile motion problems are some of the most important problems you will enco

Question

Projectile motion problems are some of the most important problems you will encounter in this course. Through this discussion, we will solve a projectile motion problem step by step. Assume a projectile is launched from ground height over a flat plane, at an angle of 50 degrees above the horizontal with an initial speed of 100 m/s. What is the initial velocity of the projectile parallel to the ground (in the x-direction) and perpendicular to the ground (in the y-direction)? Are the velocities in the x and y directions constant? Show all of your work.

Explanation / Answer

initial velocity parallel to the ground = 100*cos50 = 64.27 m/s

initial velocity perpendicular to the ground = 100*sin(50) = 76.6 m/s

velocity in the x direction is constant because there is no horizontal force.

but velocity in the y direction is not constant because of gravity force.

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