Class IX

A ball is dropped from a height of 10 m
  1. Its potential energy increases and kinetic energy decreases during the falls
  2. Its potential energy is equal to the kinetic energy during the fall.
  3. The potential energy decreases and the kinetic energy increases during the fall
  4. The potential energy is �0� and kinetic energy is maximum while it is falling.
A students caries a bag weighing 5 kg from the ground floor to his class on the first floor that is 2 m high. The work done by the boy is
  1. 1J
  2. 10J
  3. 100J
  4. 1000J
The work done is �O� if
  1. The body shows displacement in the opposite direction of the force applied.
  2. The body shows displacement in the same direction as that of the force applied
  3. The body shows a displacement in perpendicular direction to the force applied.
  4. The body masses obliquely to the direction of the force applied.
The work done is �O� if
  1. The body shows displacement in the opposite direction of the force applied.
  2. The body shows displacement in the same direction as that of the force applied
  3. body shows a displacement in perpendicular direction to the force applied.
  4. The body masses obliquely to the direction of the force applied.
How much time will be required to perform 520 J of work at the rate of 20 W?
  1. 24s
  2. 16s
  3. 20s
  4. 26s
Time Elapsed

HR : MIN : SEC
Question Answered
0
Score out of 100
0

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