Q8 of 89 Page 48

If a particle is accelerating, it is either speeding up or speeding down. Do you agree with this statement?

Acceleration is defined as the rate of change of velocity with respect to time. Changes in velocity may be due to change in direction or magnitude. Therefore, accelerating does not mean that the particle is speeding up or speeding down.


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At which point on its path a projectile has the smallest speed?

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Two particles A and B start from rest and move for equal time on a straight line. The particle A has an acceleration a for the first half of the total time and 2a for the second half. The particle B has an acceleration
2a for the first half and a for the second half. Which particle has covered larger distance?

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A food packet is dropped from a plane going at an altitude of loo m. What is the path of the packet as seen from the plane? What is the path as seen from the ground? If someone asks “what is the actual path”, what will you answer?

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Give examples 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.