Final Answer:
5. 60 km/h
6. 7.5 km
7. 800 km/h
8. 200,000 km
9. 28.89 hours (or 28 h 53 min)
11. m/s²
12. a = (v − u) / t
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Explanation:
Let’s go through each numbered question one by one.
5. Speed of a truck that travels 10 km in 10 minutes
Speed = distance ÷ time
Distance = 10 km
Time = 10 minutes = 10/60 = 1/6 hour
So speed = 10 km ÷ (1/6 h) = 10 × 6 =
60 km/h
6. Distance traveled by a police car at 1.5 km/min for 5.0 minutes
Distance = speed × time
= 1.5 km/min × 5 min =
7.5 km
7. Average speed of a jet: 4800 km in 6.00 hours
Average speed = total distance ÷ total time
= 4800 km ÷ 6 h =
800 km/h
8. Comet traveling at 50,000 km/h for 4 hours
Distance = speed × time
= 50,000 km/h × 4 h =
200,000 km
9. Time for a bird flying at 45 mph to travel 1,300 miles
Time = distance ÷ speed
= 1300 mi ÷ 45 mi/h ≈ 28.888... h
That’s about
28.89 hours, or 28 hours and 0.89×60 ≈ 53 minutes.
11. Unit of acceleration if velocity is in m/s and time in seconds
Acceleration = change in velocity ÷ time
Units: (m/s) ÷ s =
m/s²
12. Formula for acceleration
a = (final velocity − initial velocity) ÷ time
Or simply:
a = (v − u) / t
(where v = final speed, u = initial speed, t = time)
Parent Tip: Review the logic above to help your child master the concept of velocity acceleration worksheet.
