StarlyNiightidn
Answered

IDNStudy.com, ang platform na nag-uugnay ng mga tanong sa mga solusyon. Tuklasin ang libu-libong mga sagot na na-verify ng mga eksperto at hanapin ang mga solusyong kailangan mo, anuman ang paksa.

1. What is the average speed, in m/s, of a car that covers 8 km in 12 minutes?
Given: dT = _______
tT = _______
Unknown: _______
Equation: _________
Substitution: _________
Final Answer: _________

2. A car travel with an average speed of 60 km/h. How far would it travel if it moves at this rate for 5 hours?
Given: save = _______
tT = _______
Unknown: _______
Equation: _________
Substitution: _________
Final Answer: _________

3. A man walks 5 km east in 2 hours, then 2 km east in 1 hour, and finally 3 km in 1.5 hour in the same direction. What is his (a) average speed and (b) average velocity for the whole journey?
Given: dT = _______
tT = _______
dR = _______
Unknown: a. _______ b. ______
Equation: _________ Equation: _________
Substitution: _________ Substitution: __________
Final Answer: _________ Final Answer: __________

4. How long would it take a car to travel 400 km if it has an average speed of 45 km/h?
Given: save = _______
dT = _______
Unknown: _______
Equation: _________
Substitution: _________
Final Answer: _________

5. A physics teacher walks 3 km east in 1 hour and then 2 km in 0.5 hour in the same direction. What is the teacher’s average speed and average velocity for the whole trip?
Given: dT = _______
tT = _______
dR = _______
Unknown: a. _______ b. _______
Equation: _________ Equation: _________
Substitution: _________ Substitution: __________
Final Answer: _________ Final Answer: __________

Sagot :

Answer:

From the answer for the following,

1. The average speed of the car (in m/s) is 11.11 m/s.

2. The distance travelled by the car is 300 km.

3.a. His average speed for the whole journey is 2.22 km/h.

3.b. His average velocity for the whole journey is 2.22 km/h.

4. The time its take a car to travel is 8.889 hrs .

5.a. The teacher’s average speed for the whole trip is 3.33 km/h.

5.b. The teacher’s average velocity for the whole trip is 3.33 km/h.

Step-by-step explanation:

Item 1:

Given:

d=8 km=8,000 m

t=12 min=720 s

Unknown:

s= ?

Equation:

s=d/t

Substitution:

s=(8000 m)/(720 s)=11.11 m/s

Answer:

11.11 m/s

Item 2:

Given:

s=60 km/h

t=5 hrs

Unknown:

d= ?

Equation:

d=st

Substitution:

d=60 km/h∙5 hrs=300 km

Answer:

300 km

Item 3.a:

Given:

d=5 km+2 km+3 km=10 km

t=2 hrs+1 hr+1.5 hrs=4.5 hrs

Unknown:

s= ?

Equation:

s=d/t

Substitution:

s=(10 km)/(4.5 h)=2.22 km/h

Answer:

2.22 km/h

Item 3.b:

Given:

Δv=5 km+2 km+3 km=10 km

t=2 hrs+1 hr+1.5 hrs=4.5 hrs

Unknown:

v ̅= ?

Equation:

v ̅=Δv/t

Substitution:

v ̅=(10 km)/(4.5 h)=2.22 km/h

Answer:

2.22 km/h

Item 4:

Given:

d=400 km

s=45 km/h

Unknown:

t= ?

Equation:

t=d/s

Substitution:

s=(400 km )/(45 km/h)=8.889 hrs

Answer:

8.889 hrs

Item 5.a:

Given:

d=3 km+2 km=5 km

t=1 hr+0.5 hr=1.5 hrs

Unknown:

s= ?

Equation:

s=d/t

Substitution:

s=(5 km)/(1.5 hrs)=3.33 km/h

Answer:

3.33 km/h

Item 5.b:

Given:

Δx=3 km+2 km=5 km

t=1 hr+0.5 hr=1.5 hrs

Unknown:

v ̅= ?

Equation:

v ̅=Δx/t

Substitution:

v ̅=(5 km)/(1.5 hrs)=3.33 km/h

Answer:

3.33 km/h