In straight line motion the
Correct answer: A. Acceleration is parallel (or antiparallel) to the velocity.
- A. Acceleration is parallel (or antiparallel) to the velocity.
- B. Acceleration is vertical, while the velocity can be in any direction.
- C. Acceleration is perpendicular to the velocity.
- D. Acceleration is vertical and the velocity is horizontal.
Explanation
In straight line motion, the acceleration vector is either parallel or antiparallel to the velocity vector. This means acceleration acts in the same direction as the velocity to increase speed or in the opposite direction to decrease speed. Option A is correct as it accurately describes this relationship. Options B and D suggest a scenario of motion in two dimensions, which is not consistent with straight line motion. Option C suggests a perpendicular relationship, which would imply motion along a curved path, not a straight line.
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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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