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    Question

    A projectile is fired at an angle θ and reaches

    maximum height H and range R. The angle between velocity and acceleration at the highest point is:
    A 0° Correct Answer Incorrect Answer
    B 45° Correct Answer Incorrect Answer
    C 90° Correct Answer Incorrect Answer
    D 180° Correct Answer Incorrect Answer

    Solution

    At the highest point of a projectile’s motion: ●      Velocity is horizontal, since the vertical component becomes zero. ●      Acceleration is always vertically downward, due to gravity. Therefore, at the highest point, velocity is horizontal and acceleration is vertical, making them perpendicular.

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