# Projectile Motion with Basketball

by wolves5
Tags: basketball, motion, projectile
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 P: 52 A person walking with a speed of 1.45 m/sec releases a ball from a height of h = 1.3 m above the ground. Use the point on the ground, directly below where the ball is initially released at the origin of your coordinate system. Picture: https://wug-s.physics.uiuc.edu/cgi/c...ncing-ball.jpg (a) What is the ball's position at 0.25 seconds after it is released in the x and y direction? x = y = (b) What is the ball's position at 0.5 seconds after it is released in the x and y direction? x = y = (c) What is the ball's total velocity, speed and direction of motion at 0.5 seconds after it is released? vx = vy = v = Θ = For a, I tried using vf= vi + at. I used gravity (9.81) for the acceleration. However, its not right. For part b, I understand that you would use the same equation as part A, but you would just switch the 0.25 seconds to 0.5 seconds. For part c, I understand you use sin and cosine in order to solve for vx and vy.
 P: 52 a) Finding the horizontal distance after 0.25 s is fairly straightforward: Given: vx = 1.45 m/s dx = vxt = (1.45 m/s)(0.25 s) = 0.36 m Finding the vertical height at 0.25 s: Given: v1y = 0 dy = 0 + 0.5a(t)^2 = 0.5(-9.8)(0.25)^2 = -0.31 m 1.3 m - 0.31 m = 0.99 m b) ... same process c) dy = 0 + 0.5at^2 = 0.5(-9.8)(0.5)^2 = -1.23 m v2y2 - v1y2 = 2aydy v2y2 = 2(-9.8)(-1.23) + (0) v2y = 4.9 m/s v2x = 1.45 m/s (horizontal speed is constant throught) Then do a Pythagorean triangle: v^2 = (4.9)^2 + (1.45)^2 v = 4.8 m/s tanx = 4.9/1.45 x = 73.5 degrees below the horizontal

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