Solve for speed, distance or time
Grade 8 Science Worksheet
Circle the best answer, or write your answer on the line.
A bus drives 720 m at a steady 36 km/h. To change km/h to m/s, divide by 3.6. How many seconds does Ari's ride take?
A train carries Bo 360 m at a steady 72 km/h. To change km/h to m/s, divide by 3.6. How many seconds does that take?
Esme rides in a car that keeps a steady 54 km/h for 540 m. To change km/h to m/s, divide by 3.6. How many seconds is that?
Jun walks 60 m at 2 m/s, then jogs the next 60 m at 6 m/s. What is the average speed for the whole trip?
Kira bikes 144 m uphill at 6 m/s, then 144 m downhill at 12 m/s. What is the average speed for the whole ride?
What is the object's average speed over all 60 s, Noah?
- 60 m/s, since the highest point is 60 m
- 0 m/s, since it ends where it started
- 3 m/s, the speed of its first piece
- 2 m/s: it travels 60 m out and 60 m back in 60 s
How far does the object travel between 5 s and 20 s, Pia?
- 15 m
- 30 m, its distance from the start at 20 s
- 45 m, the distance of the first two pieces
- 0 m, since the object is stopped from 10 s to 30 s
Read this first
Three runners (example data)
runner distance (m) time (s) A 120 20 B 150 30 C 90 18 Each runner kept a steady speed. Which runner is fastest, Ren?
- C, since C took the least time of the three runners
- A: it runs 6 m/s, while B and C each run 5 m/s
- The three are equal, since each of them ran steadily
- B, since B ran the farthest of the three runners
Two riders (example data)
traveler speed cyclist 12 km/h runner 4 m/s A cyclist rides at 12 km/h and a runner at 4 m/s. Who is faster, Tala?
- The runner: 12 km/h is about 3.3 m/s, under 4
- The cyclist, since 12 is more than 4 in the table
- They are equal, since 12 divided by 3 is exactly 4
- Cannot tell, since the two units are different
Two robots (example data)
robot what was measured P 300 m in 2 min Q 3 m/s Robot P rolls 300 m in 2 min. Robot Q rolls at 3 m/s. Which robot is faster, Zee?
- P, since 150 is more than 3 in the table
- They are equal, since both robots roll steadily
- P, since it rolled 300 m, the longer distance
- Q: P's speed is 2.5 m/s, which is less than 3 m/s