A projectile is projected with a kinetic energy K. Its range is R. It will have minimum kinetic energy, after covering a horizontal distance equal to:
Correct answer: B. 0.5 R
- A. 0.25 R
- B. 0.5 R
- C. 0.75 R
- D. R
Explanation
The projectile's kinetic energy is minimum at the highest point of its trajectory; the highest point occurs at half the range (R/2) for symmetric projectile motion, so minimum K.E occurs after covering 0.5 R.
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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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