A car starts from rest and moves with a constant acceleration. During the 5th second of its motion, it covers a distance of 36 meters. What is the acceleration of the car?
Correct answer: B. 8 m/s2
- A. 12.5 m/s2
- B. 8 m/s2
- C. 15 m/s2
- D. 16 m/s2
- E. 14 m/s2
Explanation
Solution: S=vit+1/2 at2 36=(0)t+1/2 at2 36=1/2 at2 During 5th second: 36=1/2 a(5)2-1/2 a(4)2 36=1/2 a(25-16) 36=1/2 a(9) 36*2/9=a a=8ms-2
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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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