A rock is thrown from the ground at a speed of 22, m/s , and an angle of 55 degrees above the...
Question:
A rock is thrown from the ground at a speed of {eq}22\, m/s {/eq}, and an angle of {eq}55 {/eq} degrees above the horizontal. find the velocity and height of the rock after {eq}2 {/eq} seconds.
Free-Fall Motion
An object at free-fall moves under the sole action of gravity. The motion is accelerated in the vertical direction while maintaining a constant velocity in the horizontal. This mixed motion is best described by the parametric equations along the Cartesian axes,
{eq}x=v_{0x}t {/eq},
{eq}y=v_{0y}t-\dfrac{1}{2}gt^2 {/eq}.
In these equations time acts as the parameter, the motion starts from the coordinate origin, and gravity opposes the positive direction of the x-axis. The trajectory is completely defined by the initial projections of the object's velocity.
Answer and Explanation: 1
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{eq}\bullet \; v_0=22.0 \;\rm m/s {/eq}, the initial velocity of the rock.
{eq}\bullet \; \theta=55^\circ {/eq}, the initial...
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