10 minutes maximum! (can you do it in 5?)

Grab a calculator  time for some maths... 
1. Which of these is the correct formula for speed?
 A. speed = distance x time^{}
 B. speed = distance x acceleration
 C. speed = distance ÷ time
 D. speed = distance ÷ acceleration


2. A tortoise is pretty slow, only covering 100 cm in 50 seconds. It therefore has a speed of
 A. 2 m/s
 B. 2 cm/s
 C. 0.5 m/s
 D. 0.5 cm/s


3. A cheetah can run at a top speed of 30 m/s. How far could it run in 5 seconds?
 A. 0.16 m
 B. 6 m
 C. 150 m
 D. 15 m



4. How long would it take the cheetah to cover 600 m?
 A. 20 s
 B. 0.05 s
 C. 200 s
 D. 18000 s


5. Which of these is the correct formula for acceleration?
 A. acceleration = velocity x time^{}
 B. acceleration = change in velocity x time^{}
 C. acceleration = velocity ÷ time^{}
 D. acceleration = change in velocity ÷ time


6. What are the correct units for acceleration?
 A. "meters per second"
 B. "meters seconds"
 C. "meters seconds squared"
 D. "meters per second squared"


What are the missing numbers in this table showing the acceleration of different motor boats? 


acceleration (m/s^{2}) 


Time (s) 
7. 

0 
20 
5 
8. 
3 
0 
30 

9. 
4 
5 
 10 

10. A toy car accelerates across the floor at 2 m/s^{2}. After 3 seconds the velocity is 10 m/s. What was the starting velocity?
 A. 60 m/s
 B. 10 m/s
 C. 6 m/s
 D. 4 m/s


