Learn Encapsulation by Building a Projectile Trajectory Calculator - Step 6

Python
1

Tell us what’s happening:

am i missing something here? i don’t know how to do the v squared power of two also i keep getting Projectile(12, 12, 12) as error For Projectile(12, 12, 12) , given the 4 $x$ coordinates of 0, 1, 2 and 3, the y coordinate should be approximately 12, 12.18, 12.28, 12.32. what does this mean?

Your code so far

import math

GRAVITATIONAL_ACCELERATION = 9.81
PROJECTILE = "∙"
x_axis_tick = "T"
y_axis_tick = "⊣"

class Projectile:
    __slots__ = ('__speed', '__height', '__angle')

    def __init__(self, speed, height, angle):
        self.__speed = speed
        self.__height = height
        self.__angle = math.radians(angle)
        
    def __str__(self):
        return f'''
Projectile details:
speed: {self.__speed} m/s
height: {self.__height} m
angle: {round(math.degrees(self.__angle))}°
displacement: {round(self.__calculate_displacement(), 1)} m
'''

    def __calculate_displacement(self):
        horizontal_component = self.__speed * math.cos(self.__angle)
        vertical_component = self.__speed * math.sin(self.__angle)
        squared_component = vertical_component**2
        gh_component = 2 * GRAVITATIONAL_ACCELERATION * self.__height
        sqrt_component = math.sqrt(squared_component + gh_component)
        
        return horizontal_component * (vertical_component + sqrt_component) / GRAVITATIONAL_ACCELERATION
    def __calculate_y_coordinate(self,x):
        vertical_component = (self.__speed * math.sin(self.__angle))*0+ x * math.tan(self.__angle) - GRAVITATIONAL_ACCELERATION*x**2/2*self.__speed**2 * math.cos(self.__angle) 

# User Editable Region

    

# User Editable Region


ball = Projectile(10, 3, 45)
print(ball)
ball._Projectile__calculate_y_coordinate(1)

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Challenge Information:

Learn Encapsulation by Building a Projectile Trajectory Calculator - Step 6

2

as you are missing a return statement in the function, you are not going to get any valuable feedback from the tests

which part of the formula are you talking about? I don’t understand

it means that for a Projectile with starting speed of 12 m/s, starting height of 12 m, and starting angle of 12 °, for an x value of 0m, 1m, 2m, 3m, the y value is 12m, 12.18m, 12.28m and 12.32m

3

im talking about the 2 times v squared 0 in the denominator

4

v_0 is the starting value of speed, which you have. You need to square it, which is explained in the instructions how to do.

7

This topic was automatically closed 182 days after the last reply. New replies are no longer allowed.