1.If a league is equal to 3 miles, how many miles are there in \"20,000 Leagues

Question

1.If a league is equal to 3 miles, how many miles are there in "20,000 Leagues Under the Sea?"

2.A car is accelerating at 4 m/s2. At some time it is traveling at 40 m/s. How fast will it be going 1 s later?

3. A yellow car takes 10 minutes to go from milepost 101 to milepost 109. A red car takes 10 minutes to go from milepost 11 to milepost 21. Which car has the higher average speed?

d. Their average speeds are the same.

4. Which of the following could be a velocity?

d. 5 meters west

5.If a ball is dropped from rest, it will fall 5 m during the first second. How far will it fall during the first 2 s?

a. 25m

b. 20m

c. 10m

d. 15m

6. If the mass and weight of an astronaut are measured on Earth and on the Moon, we will find that the masses are ____ and the weights are ____.

a. the same; different

b. different; the same

c. different; different

d. the same; the same

Explanation / Answer

1)

1 league = 3 mile

20000 League = 20000*3 miles = 60000miles

2) vf=vi +at = 40 + 4.0*1.0 = 44 m/s

3)

Vave = D/t

Vave(yellow)=D1/t1 = 2mile/10min = 0.5mile/min

Vave(red)=D2/t1 = 10mile/10min = 1mile/min

Thus,

Vave(yellow) > Vave(red)

4)

Velocity has unit meter/second hence option c) is correct.

5) t=2s , vi=0m/s

Use equation,

d=vi*t+1/2gt^2 = 0*2-1/2*9.8*2^2 = 19.6 m

6)

Mass is a fundamental quantity, it can’t be change. Weight = mass*gravity.

Thus masses are equal and the weights are different.

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