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Artist 52 [7]
2 years ago
6

Pls help me I want to get this done

Physics
1 answer:
Simora [160]2 years ago
8 0
K:potassium
Cu:copper
Cl: chlorine
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A car is driving away from a crosswalk. The formula d = t 2 + 2 t expresses the car's distance from the crosswalk in feet, d , i
Ede4ka [16]

Answer:

1) No, the car does not travel at constant speed.

2) V = 9 ft/s

3) No, the car does not travel at constant speed.

4) V = 5.9 ft/s

Explanation:

In order to know if the car is traveling at constant speed we need to derive the given formula. That way we get speed as a function of time:

V(t) = 2*t + 2   Since the speed depends on time, the speed is not constant at any time.

For the average speed we evaluate the formula for t=2 and t=5:

d(2) = 8 ft     and      d(5) = 35 ft

V_{2-5}=\frac{d(5)-d(2)}{5-2}=9 ft/s

Again, for the average speed we evaluate the formula for t=1.8 and t=2.1:

d(1.8) = 6.84 ft     and      d(2.1) = 8.61 ft

V_{1.8-2.1}=\frac{d(2.1)-d(1.8)}{2.1-1.8}=5.9 ft/s

4 0
3 years ago
The unit meters corresponds to what variable
Sati [7]

Do you have any options? My guess would be distance but I could be wrong.

7 0
3 years ago
If a 60 kg woman, runs up a flight of stairs having a total rise of 4.0m in a time of 4.2s. What average power did she supply?
LenKa [72]
 <span>PE = m * g * h 
PE = 60 * 9.8 * 4 
PE = 2352 J 

Power = E/t 

Power = PE/t 
Power = 2352/4.2 
Power = 560 Watt</span>
6 0
3 years ago
The rock cycle _____.
Reika [66]
B is the answer you need and i honestly got this question on a middle school test

you must be in different area then me

4 0
3 years ago
Read 2 more answers
Select the correct answer. A truck moves 60 kilometers east from point A to point B. At point B, it turns back west and stops 15
katovenus [111]

Answer:

Option a

Explanation:

8 0
2 years ago
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