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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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