Final answer:
The vertical component of velocity of the rock remains constant as it rises when thrown upward at 50 degrees with respect to the horizontal.
Step-by-step explanation:
In this scenario, the rock is thrown upward at an angle of 50 degrees with respect to the horizontal. As the rock rises, neglecting air drag, its vertical component of velocity remains constant.
When an object is thrown vertically upward or downward, its vertical velocity remains constant throughout the motion, ignoring the effect of air resistance. In this case, the vertical component of velocity of the rock remains the same as it rises.
For example, if the initial velocity of the rock is 13.0 m/s upwards, its velocity would still be 13.0 m/s upwards at any given vertical position, as long as we neglect the effect of air resistance.