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Answer the following questions briefly and to the point: 7x1] The average velocity of a particle is equal to its instantaneous velocity. What is the shape of the displacement-time graph? & My cycle has northward velocity and southward acceleration. Explain. Give an example of a quantity which has unit but no dimension. it Where does the centre of mass of a two particle system lie, if one particle is more massive than the other? D If a body is not at rest, the net external force acting on it cannot be zero. Is it true or false? Justify. by What is critical velocity? D) What is the work done in blowing a soap bubble of radius R and surface tension T? 14x2=8]

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Q1
Give example where (a) the velocity of a particle is zero but its acceleration is not zero, (b) the velocity is opposite in direction to the acceleration, (c) the velocity is perpendicular to the acceleration.
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Q2
Pick the correct statements:
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Q3
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Q4
Assertion :Average velocity of the body may be equal to its instantaneous velocity at all points of time. Reason: If a body is having uniform motion in one dimension, then velocity is constant and average velocity can be equal to instantaneous velocity
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Q5
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