10 minutes maximum! (can you do it in 5?)
Q15...
A tennis ball  initially at rest  is dropped from a height of 5 m.


1. Which of these answers correctly labels the letters 's', 'v' and 'u' in the 'suvats' equations?
 A. s= speed, v = initial velocity, u = final velocity
 B. s= speed, v = final velocity, u = initial velocity
 C. s= displacement, v = initial velocity, u = final velocity
 D. s= displacement, v = final velocity, u = initial velocity


2. Which of these answers correctly gives the values for 's', and 'u' and 'a' in the 'suvats' equations? (No units are given).
 A. s= 0, a= 0, u = 0
 B. s= 0, a = 10, u = 0
 C. s= 5, a = 10, u = 0
 D. s= 5, a = 10, u = 10


3. Which of these equations can be used without further calculation to find the impact velocity?
 A. v = u + at
 B. s= ut + ½ at^{2}
 C. v^{2} = u^{2} + 2as
 D. s = ½ (u+v).t


4. What is the impact velocity of the ball?
 A. 5 ms^{1}
 B. 10 ms^{1}
 C. √50 ms^{1}
 D. 100 ms^{1}


5. How long did it take for the ball to fall?
 A. 2 s^{}
 B. 0.5 s^{}
 C. 1 s^{}
 D. 10 s^{}


6&7. A ball is rolled down a steep slope. The initial velocity is 2 ms^{1} and it accelerates at a rate of 4 ms^{2} for 5 seconds. 

6. What is the final velocity of the ball?
 A. 20 ms^{1}
 B. 22 ms^{1}
 C. 24 ms^{1}
 D. 10 ms^{1}


7. How far does the ball roll in this time?
 A. 8 m
 B. 28 m^{}
 C. 50 m
 D. 60 m^{}



810. A stone is thrown horizontally at 10 ms^{1 }from a cliff of height 5 m.
Air resistance can be ignored.


8. Which of these correctly describes the changes in the horizontal and vertical components of velocity of the stone?

Horizontal velocity 
Vertical velocity 
A 
constant 
increasing 
B 
increasing 
constant 
C 
constant 
constant 
D 
decreasing 
increasing 


9. What is the vertical velocity of the stone on impact?
 A. 5 ms^{1}
 B. 10 ms^{1}
 C. √50 ms^{1}
 D. 100 ms^{1}


10. The stone takes 1 second to reach the ground. How far from the cliff edge does the stone land?
 A. 10 m
 B. 20 m^{}
 C. 30 m^{}
 D. 40 m


