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Classical Mechanics

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Components of Initial Velocity

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Suppose a catapult launches a projectile that, in the instant it is released, moves with initial speed $v_o$ at an angle $\theta$ above horizontal.

Which of the following expressions below would you use to find the x-component (horizontal component) of the velocity?

A

$\frac{v_x}{|\vec{v}|}\hat{i}+\frac{v_y}{|\vec{v}|}\hat{j}$

B

$v_o \sin\theta$

C

$v_o \cos\theta$

D

$\sqrt{ v_x^2 + v_y^2}$