# Answer on Mechanics | Relativity Question for nthabiseng

Question #25823

19. When is the magnitude of the ball’s velocity equal to half its initial velocity?

a) 15.29 s & 45.87 s b) 3.06 s & 6.12 s c) 2.04 s & 3.06 s d) 0 s & 6.12 s

e) None of them

20. When is the magnitude of the ball’s displacement equal to half the maximum it rises?

a) 8.96 s & 52.20 s b) 0.90 s & 5.22 s c) 2.04 s & 3.06 s d) 3.06 s & 6.12 s

e) None of them

21. What are the magnitude and direction of the acceleration while the ball is

moving upward?

a) - 9.81 m/s2 upward b) - 9.81 m/s2 downward c) 9.81 m/s2 downward

d) 9.81 m/s2 upward e) None of them

22. What are the magnitude and direction of the acceleration while the ball is moving downward?

a) - 9.81 m/s2 upward b) - 9.81 m/s2 downward c) 9.81 m/s2 downward

d) 9.81 m/s2 upward e) None of them

23. What are the magnitude and direction of the acceleration when the ball is at the highest point?

a) - 9.81 m/s2 upward b) - 9.81 m/s2 downward c) 9.81 m/s2 downward

d) 9.81 m/s2 upward e) None of them

A frog jumps at an angle of 30o to the horizontal with an initial velocity of 36km/h.

24. The velocity vox of the frog is

a) 8.6 m/s b) 10.0 m/s c) 9.81 m/s d) -10.0 m/s e) None of them

25. The velocity voy of the frog is

a) 8.6 m/s b) 5.0 m/s c) 9.81 m/s d) -10.0 m/s e) None of them

26. The acceleration ax of the frog is

a) 9.81 m/s2 b) – 9.81 m/s2 c) 0.00 m/s2 d) 10.0 m/s2 e) None of them

27. The acceleration ay of the frog is

a) 9.81 m/s2 b) – 9.81 m/s2 c) 0.0 m/s2 d) 10.0 m/s2 e) None of them

a) 15.29 s & 45.87 s b) 3.06 s & 6.12 s c) 2.04 s & 3.06 s d) 0 s & 6.12 s

e) None of them

20. When is the magnitude of the ball’s displacement equal to half the maximum it rises?

a) 8.96 s & 52.20 s b) 0.90 s & 5.22 s c) 2.04 s & 3.06 s d) 3.06 s & 6.12 s

e) None of them

21. What are the magnitude and direction of the acceleration while the ball is

moving upward?

a) - 9.81 m/s2 upward b) - 9.81 m/s2 downward c) 9.81 m/s2 downward

d) 9.81 m/s2 upward e) None of them

22. What are the magnitude and direction of the acceleration while the ball is moving downward?

a) - 9.81 m/s2 upward b) - 9.81 m/s2 downward c) 9.81 m/s2 downward

d) 9.81 m/s2 upward e) None of them

23. What are the magnitude and direction of the acceleration when the ball is at the highest point?

a) - 9.81 m/s2 upward b) - 9.81 m/s2 downward c) 9.81 m/s2 downward

d) 9.81 m/s2 upward e) None of them

A frog jumps at an angle of 30o to the horizontal with an initial velocity of 36km/h.

24. The velocity vox of the frog is

a) 8.6 m/s b) 10.0 m/s c) 9.81 m/s d) -10.0 m/s e) None of them

25. The velocity voy of the frog is

a) 8.6 m/s b) 5.0 m/s c) 9.81 m/s d) -10.0 m/s e) None of them

26. The acceleration ax of the frog is

a) 9.81 m/s2 b) – 9.81 m/s2 c) 0.00 m/s2 d) 10.0 m/s2 e) None of them

27. The acceleration ay of the frog is

a) 9.81 m/s2 b) – 9.81 m/s2 c) 0.0 m/s2 d) 10.0 m/s2 e) None of them

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