Starting with the pumpkin as your projectile, gather data and answer the following questions. a. with an initial speed of 18m/s and no air resistance, what angle must the cannon be at to hit the bull’s eye? 75degreesb. clear your results from part a. now add air resistanceand answer the same question.70 degreesc. clear your results from part b and remove the air resistance. collect data to figure out how the angle must be changed to hit the bull’s eye as the initial speed increasescol1 initial speed 14m/s 18m/s 22m/s 26m/scol2 angle 65 75 80 83

a) 75°

b) 72° (with drag coefficient = 2 and altitude = 1 m)

c) 63° (with initial speed = 14 m/s)

80° (initial speed = 22 m/s)

83° (initial speed = 26 m/s)

Explanation:

By using projectile motion simulator from the website, "http://phet.colorado.edu/sims/projectile-motion/projectile-motion.swf", desired answers can be found accordingly.

a) When we need to arrange degree at 75° , it hits the bull's eye.

b) By adding air resistence with drag coefficient = 2 and altitude = 1 m,

to hit the bull's eye, we need to arrange degree at 72°

c) With initial speed = 14 m/s, we need to arrange degree at 63°

With initial speed = 22 m/s, we need to arrange degree at 80°

With initial speed = 26 m/s, we need to arrange degree at 83°

So, as the initial speed increases, the angle also increases.

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