1.

State with reasons, if it is possible or impossible, for an object in motion to have:Zero distance covered and may have non zero displacement.Zero speed at an instant but non zero acceleration at the same time.Zero speed and may have non zero velocity.Acceleration opposite to the direction of motion.Positive acceleration while speeding up.

Answer»
  1. Impossible, as displacement refers to the shortest route or minimum possible distance to travel from initial to final position.
  2. Possible, as the object/ball kept on a height may have zero speed, but due to acceleration due to gravity, i.e. non-zero acceleration it tends to fall down.
  3. Impossible, as speed is equal to zero so displacement is also zero.
  4. Possible, in case of frictional force, a moving body may have retardation opposite to the direction of motion.
  5. Possible, as speed is increasing so does the velocity is increasing and thus, acceleration is postive.


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