GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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its velocity must be positive
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its velocity must be negative
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it must be slowing down
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it must be speeding up
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none of the above must be true
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Detailed explanation-1: -1 Answer. Correct option (E) none of the above must be true. Acceleration is independent of velocity (you can accelerate in any direction while traveling in a ny direction).
Detailed explanation-2: -When an object is speeding up, the acceleration is in the same direction as the velocity. Thus, this object has a positive acceleration.
Detailed explanation-3: -The position of a particle moving along the x-axis varies with time t as x=4t−t2+1.
Detailed explanation-4: -For a particle moving along x-axis, the acceleration a of the particle in terms of its x-coordinate x is given by a=−9x, where x is in meters and a is in m/s2. Take acceleration, velocity and displacement in positive x-direction as positive. The initial velocity of particle at x=0 is u=+6 m/s.
Detailed explanation-5: -the velocity of a particle moving on the x-axis is given by v=x2+x.