Two balls are kicked with the same initial speeds. Ball A was kicked at the angle 20° above horizontal and ball B was kicked at the angle 75° above horizontal. What ball will have bigger speed at the highest point of their trajectory? (section 4.3) Ball A Ball B Impossible to answer without knowing their actual initial speeds. They will have the same speeds

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14-09-2019
Physics

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Two balls are kicked with the same initial speeds. Ball A was kicked at the angle 20° above horizontal and ball B was kicked at the angle 75° above horizontal. What ball will have bigger speed at the highest point of their trajectory? (section 4.3) Ball A Ball B Impossible to answer without knowing their actual initial speeds. They will have the same speeds

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ConcepcionPetillo ConcepcionPetillo · Answer 1 · 2019-09-18T20:11:27+02:00

Answer:

Ball A

Solution:

According to the question:

Two balls A and B are kicked at angle [tex]20^{\circ}[/tex] and [tex]75^{\circ}[/tex] respectively.

The component of the velocity that provides the ball with the forward movement is the horizontal component, i.e., cosine of the angle.

Since, cos[tex]20^{\circ}[/tex] is greater than cos[tex]75^{\circ}[/tex] and thus Ball A will have more speed than ball B at the top most point of the trajectory.