What is the average velocity of a projectile between the instants it crosses half the maximum height? It is projected with a speed u at an angle θ with the horizontal:
Correct answer: B. ucosθ
- A. usinθ
- B. ucosθ
- C. utanθ
- D. u
Explanation
When the projectile is between the instants it crosses half the maximum height, the horizontal component of velocity remains constant atucosθ.This is because there is no effect of the vertical component of velocity during this displacement. Therefore, the average velocity during this specific displacement isucosθin the horizontal direction.
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About Force and Motion
Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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