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Which of the following is a speed, not a velocity?
A) 35 m/s east
B) -35 m/s
C) 35 m/s
D) 35 m/s south

A car traveled at an average speed of 60 mph for two hours. How far did it travel?
A) 30 miles
B) 60 miles
C) 120 miles
D) 150 miles
A cyclist rode at an average speed of 15 mph for 30 miles. How long was the ride?
A) 2 hours
B) 1 hour
C) 0.5 hours
D) 3 hour

Respuesta :

the first one is C because velocity is speed AND direction, and it  is impossible to go a negative speed. the second one is C because if you go 60 miles an hour for two miles (60 times 2) its 120. and the third one is A because if you go 15 miles an hour and go 30 miles, (30 divided by 15) it takes two hours
1.Remember that Velocity is speed with a direction, which make option A and option D a velocity
The one that is a speed is : C. 35m/s (a speed cannot be in a negative value)

2.You just need to multiply the speed with the time,
The answer is : 60 mph x 2 =  C. 120 miles

3. In this case, you just need to divide the distance with the speed
The answer is : 30 miles/ 13mph = A. 2 hours

hope this helps

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