1:A runner\'s average speed is 6 mph, how far could he run in 2.5 hours? Select

Question

1:A runner's average speed is 6 mph, how far could he run in 2.5 hours?

Select one:

a. 6 miles

b. 12 miles

c. 18 miles

d. 15 miles

e. none of above

2:When we say that light objects and heavy objects fall at the same rate, what assumption are we making?

Select one:

a. they have the same shape

b. they are made of the same material

c. they are falling in a vacuum

d. they have the same size

e. none of above

3:A runner's speed is 6 mph due south, the wind's speed is 6 mph due north, how far could he run in 2 hours?

Select one:

a. 12 miles

b. 8 miles

c. 0 miles

d. 16 miles

e. none of above

4:How many hour are required to make a 4000 km trip if your average speed is 80 km/h?

Select one:

a. 40 h

b. 45 h

c. 50 h

d. 100 h

e. none of above

Explanation / Answer

1 ans

average speed =6 milesper hour

time t=2.5 hours

this concept belongs to the motion in two dimensional

average speed =total displacement/time

therefore the total displacement=average speed *time=6*2.5=15 miles

the correct option D

2 ans

the time to hit the ground is depends upon material

so the both the bodies are containes same material

3 ans

velocity on south Vs=6 mph

velocity on north Vn=6 mph

time t=2 hours

the velocity V=2*6*6/12=6 mph

the total displacement S=6*2=12 mph

4 ans

total displacement S=4000 m

average speed v=80 km/h

the time =total displacement/average speed=4000/80=50 h

the correct option C

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