A car moving with an initial velocity of 25 m/s north has a constant acceleration of 3 m/s2 south. After 6 s its velocity will be:
Correct answer: A. 7 m/s north
- A. 7 m/s north
- B. 43 m/s north
- C. 7 m/s south
- D. 20 m/s north
Explanation
car is moving with decreasing velocity thus it has negative acceleration.
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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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