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a horizontal rifle is fired at a bull's-eye. the muzzle speed of the bullet is 655 m/s. the gun is pointed directly at the center of the bull's-eye, but the bullet strikes the target 0.029 m below the center. what is the horizontal distance between the end of the rifle and the bull's-eye?



Answer :

The horizontal distance between the end of the rifle and the eye of the bull is equal to 50.35 m.

What are the equations of motion?

The equations of motion can be described as the equations which set up the relationship between the velocity of the object, the acceleration, time, and distance of the moving object.

Consider that a vector r, which describes the position of the bullet when it reaches the target, is composed of [tex]r_x[/tex] and [tex]r_y[/tex]

[tex]r = (r_x, r_y)[/tex]

Given that [tex]r_y[/tex] is -0.029 m (the reference is located at the end of the rifle),

r =([tex]r_x[/tex], -0.029 m)

The vertical position of the bullet at time 't'  can be written in form of an equation as follows:

[tex]y = (y_o +v_oy) t + \frac{1}{2} g t^2[/tex]

The vertical component of the speed at t = 0 is 0, then, acceleration, v₀y = 0 and y₀ = 0.

Then, we can find the time for the vertical position (y) of bullet -0.029 m:

-0.029 m =(0)t - (1/2) · (9.8 m/s²) · t²

t = 0.077 sec

The equation for the horizontal position  can be written as:

x = x₀ + (v₀x) · t

Since the origin of the reference system is located at the bullet starts its trajectory, x₀ = 0.

x = (v₀x) · t

x = (655) × 0.077 = 50.35m

Learn more about equations of motion, here:

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