Consider a projectile thrown initially at a. speed of 20 m/s at an angle of 760 from horizontal: When it reaches the highest point of its trajectory, angle between its velocity and acceleration is;
Correct answer: C. 90o
- A. 0o
- B. 45o
- C. 90o
- D. None of the above
Explanation
When the projectile reaches the highest point of its trajectory, the angle between its velocity and acceleration is 90 degrees. This is because at the highest point, the velocity is purely horizontal and the acceleration due to gravity acts vertically downward. The two vectors are perpendicular to each other, resulting in a 90-degree angle.
This question appeared on the KMU Centralized Admission Test 2021 paper, which you can sit online with every answer explained.
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About Projectile Motion
Projectile motion combines uniform horizontal motion with vertically accelerated motion under gravity, assuming air resistance is neglected. Questions use the components of initial velocity to find time of flight, maximum height, horizontal range and position, while distinguishing projectile motion from general circular or one dimensional motion.
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