10 minutes maximum! Can you do it in 5?

Q1-5...

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 at²
• C. v² = u² + 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

8-10. 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?

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