Question

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

Answer 1

Ball A

Solution:

According to the question:

Two balls A and B are kicked at angle
`20^(\circ)` and
`75^(\circ)` 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
`20^(\circ)` is greater than cos
`75^(\circ)` and thus Ball A will have more speed than ball B at the top most point of the trajectory.