Which statement is true for a ball thrown at 20 degrees with the horizontal, when it is at the highest point in its trajectory?

Its velocity is nonzero but its acceleration is zero

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Its velocity is perpendicular to its acceleration

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Its velocity and acceleration are both zero

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Its velocity is zero but its acceleration is nonzero

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Solution

The correct option is B
Its velocity is perpendicular to its acceleration

The acceleration is always g pointing down at all times during flight. So (a) and (d) are not correct. The y-component of velocity is zero, but it is still moving in the x-direction, so (c) is not correct. At the top the motion is in the x direction only and the acceleration is in the y direction, so the two are perpendicular.

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