Which of the following statements is true? (Give all correct statements in order

Question

1. Which of the following statements is true? (Give all correct statements in order;i.e. AD, BCD, etc.)
2. 
   
3. 
   
4. A) An object can have a zero velocity and still be accelerating.
5. 
   
6. B) An object with a constant speed always has zero acceleration.
7. 
   
8. C) The velocity of an object can reverse direction when its acceleration is constant.
9. 
   
10. D) When the velocity is constant, the average velocity over any time interval can not differ from the instantaneous velocity at any instant in that time interval.
11. 
    
12. E) If the vector sum of two velocities is zero, then the magnitudes of those two velocities are equal

RELATED QUESTION, IF YOU CAN DO IT:

1. Assume you are a medieval knight attacking a castle with a canon. The ball leaves the cannon with a speed of 44.7m/s. The barrel's angle with respect to the ground is 34.9

o, and you make a perfect hit on the tyrant's chamber which is at the same level as the cannon's muzzle (H=0). What is the time of flight of the cannon ball?


RELATED QUESTION, IF YOU CAN DO IT:

1. Assume you are a medieval knight attacking a castle with a canon. The ball leaves the cannon with a speed of 44.7m/s. The barrel's angle with respect to the ground is 34.9

o, and you make a perfect hit on the tyrant's chamber which is at the same level as the cannon's muzzle (H=0). What is the time of flight of the cannon ball?

Explanation / Answer

Correct answer:

A) True

B) False (example circular motion)

C) True (example deceleration, i.e., negative acceleration)

D) True

E) True (equal in magnitude and opposite in direction)

Hence: ACDE

Part 2:

Considering the vertical component of velocity, displacement and acceleration

44.7*sin(34.9)*t - 0.5*9.8*t^2 = 0

Hence: Answer = t = 5.22s

I am sure about this)

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