7 Questions

Questions and Answers

- 1.A car accelerates from 5.0 m/s to 21 m/s at a rate of 3.0 m/s
^{2}. How far does it travel while accelerating?- A.
69 m

- B.
207 m

- C.
41 m

- D.
117 m

- 2.An airplane needs to reach a velocity of 203.0 km/h to take off. On a 2000 m runway, what is the minimum acceleration necessary for the plane to take flight?
- A.
0.79 m/s2

- B.
0.87 m/s2

- C.
0.95 m/s2

- D.
1.0 m/s2

- 3.Assuming equal rates of acceleration in both cases, how much further would you travel if braking from 56 mi/hr to rest than from 28 mi/hr?
- A.
3.2 times farther

- B.
4 times farther

- C.
4.8 times farther

- D.
5.2 times farther

- 4.A sports car has an average acceleration of 13.1 miles/hr/sec. how long does it take for the car to reach 60. mi/hr, if it starts from rest?
- A.
5.5 s

- B.
3.1 s

- C.
4.6 s

- D.
8.8 s

- 5.A car is traveling north at 17.7 m/s. After 12 s its velocity is 14.1 m/s in the same direction. Find the magnitude and direction of the car's average acceleration.
- A.
2.7 m/s2, South

- B.
0.30 m/s2, North

- C.
2.7 m/s2, North

- D.
0.30 m/s2, South

- 6.Acceleration is sometimes expressed in multiples of g, where g = 9.8m/s
^{2 }is the acceleration due to the earth's gravity. In a car crash, the car's velocity may go from 26 m/s to 0 m/s in 0.15s. How many g's are experienced, on average, by the driver.- A.
13 g

- B.
18 g

- C.
22 g

- D.
23 g

- 7.
- A.
0.14 m/s2

- B.
0.17 m/s2

- C.
0.19 m/s2

- D.
0.20 m/s2

- E.
0.16 m/s2