Determine for each of the of the following whether it is always true or could be

Question

Determine for each of the of the following whether it is always true or could be false. True The speed of a particle is always positive. True The speed of a particle with a positive acceleration is always increasing. True When the average velocity of a particle is zero, its average speed is also equal to zero. True The acceleration of a particle can be non-zero when its speed is constant. True The average speed of a particle is equal to the magnitude of its average velocity True When the acceleration of a particle is zero, its average speed is equal to the magnitude of its average velocity. True The velocity of an object can reverse direction when its acceleration is constant. Submit AnswerIncorrect. Tries 5/10 Previous Tries

Explanation / Answer

(i) True. (Speed is a scalar quantity)

(ii) True. (Same reason as mentioned above)

(iii) False. (This is not always true)

(iv) False. (If speed is constant than acceleration = 0)

(v) False (This is not always true)

(vi) False

(vii) False (Acceleration = Rate of change of the velocity).

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