Jack rides his skateboard a total distance of 120 m in 20 sec. What was his speed?
5 seconds after he started Jack was at a distance of 30 meters. 10 seconds after he started he was at a distance of 70 meters. What was Jack’s speed from time = 5 sec to time = 10 sec?
Did Jack travel at a constant speed? How do you know?
this was my hw and the answer for c or the last question that Henry posted doesn't make sense. well the answer does but not the explanation.
a. Speed = 120m/20s = 6 m/s.
b. Speed = (70m-30m)/(10s-5s) = 8 m/s.
c. No, Jack did not travel at a constant speed:
30m/5s = 6 m/s after 5 s.
70m/10s = 7 m/s after 10 s.
bleh
To find Jack's speed, we need to use the formula: speed = distance / time.
In the first question, we are given that Jack rides a total distance of 120 m in 20 sec. To find his speed, we divide the total distance by the total time, like this:
speed = distance / time
speed = 120 m / 20 sec
speed = 6 m/s
So, Jack's speed is 6 m/s.
In the second question, we want to find Jack's speed from time = 5 sec to time = 10 sec. To calculate this, we need to find the distance he traveled between these two time intervals.
Distance traveled from time = 0 sec to time = 5 sec = 30 m
Distance traveled from time = 0 sec to time = 10 sec = 70 m
To get the distance traveled between time = 5 sec to time = 10 sec, we subtract the distance at time = 5 sec from the distance at time = 10 sec, like this:
Distance traveled from time = 5 sec to time = 10 sec = Distance at time = 10 sec - Distance at time = 5 sec
Distance traveled from time = 5 sec to time = 10 sec = 70 m - 30 m
Distance traveled from time = 5 sec to time = 10 sec = 40 m
So, Jack traveled a distance of 40 m from time = 5 sec to time = 10 sec.
Now we can find his speed during this specific time interval. We divide the distance traveled by the time elapsed, like this:
speed = distance / time
speed = 40 m / 5 sec
speed = 8 m/s
Therefore, Jack's speed from time = 5 sec to time = 10 sec is 8 m/s.
Lastly, to determine if Jack traveled at a constant speed, we compare the speeds calculated in both questions. If the speeds are the same, then Jack traveled at a constant speed. In this case, his speed in the first question was 6 m/s, and in the second question, it was 8 m/s. Since the speeds are different, we can conclude that Jack did not travel at a constant speed.