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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:

    • The velocity is purely horizontal, since the vertical component becomes zero.
    • The acceleration due to gravity is always vertically downward.
    So at the highest point:
    • Velocity vector → horizontal
    • Acceleration vector → vertical (downward)
    Therefore, the angle between velocity and acceleration vectors is: 90°

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