Please show how you got the answer. 4. What is larger 4000 L or 4 x 10 5 cm 3 an

Question

Please show how you got the answer.

4. What is larger 4000 L or 4 x 105 cm3 and you must show your reasoning.

5. A car travels 120 meters in one direction in 20 seconds. Then the car returns ¾ of the way back in 10 seconds.

a) Calculate the average speed of the car for the first part of the trip.

b) Find the average velocity of the car.

6. A sports car moving at constant speed travels 150 m in 4.00 s. If it then brakes and comes to a stop while decelerating at a rate of 6.0 m/s2. How long does it take to stop?

7. Explain a possible situation where you start with a positive velocity that decreases to a negative increasing velocity while there is a constant negative acceleration.

8. A stone is dropped from the roof of a high building. A second stone is dropped 1.25 s later. How long does it take for the stones to be 25.0 meters apart?

Explanation / Answer

4.)
1 L = 1000 cm^3
4000 L = 4000 * 1000 cm^3
4000 L = 4 * 10^6 cm^3

Therefore We can cl;early see 4000 L is Greater.

5.)
Speed = Distance / time
Speed = (120 + 3/4* 120) / (20 + 10)
Average Speed = 7 m/s

Velocity = Displacement/ Time
Velocity = (120 - 3/4* 120) / (20 + 10)
Average Velocity = 1 m/s

6.
Speed of sports car = 150/4 = 37.5 m/s
Final Speed = 0
decelerating rate = 6.0 m/s2
v = u - a*t
u = a*t
t = 37.5/6.0
t = 6.25 s

Time taken to stop, t =6.25 s

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