An object moves 20 m towards the east and then 10m towards the west in 5 seconds. What is its average velocity and average speed?
Correct answer: A. Speed = 6 m/s, velocity = 2 m/s
- A. Speed = 6 m/s, velocity = 2 m/s
- B. Speed = 6 m/s, velocity = 6 m/s
- C. Speed = 2 m/s, velocity = 2 m/s
- D. Speed = 2 m/s, velocity = 6 m/s
Explanation
Speed = total distance/time = 10+20/5 = 6m/s Velocity = total displacement/time = 20-10/5 = 2m/s So A is the correct answer.
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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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