A car is travelling in a straight line along a highway at a constant speed of 80miles per hour for 10 seconds. Find its acceleration.
Correct answer: C. 0 m/s2
- A. 100 m/s2
- B. 200 m/s2
- C. 0 m/s2
- D. 150 m/s2
- E. 220 m/s2
Explanation
The correct answer is 0 m/s2. When a car is traveling at a constant speed, its velocity remains unchanged over time. Acceleration is calculated as the change in velocity divided by the time taken for that change. Since there is no change in velocity, the acceleration is zero. The other options suggest positive values for acceleration, which would imply a change in velocity, contradicting the condition of constant speed.
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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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