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.
The spring will have maximum potential energy when
  1. it is pulled out
  2. it is compressed
  3. Both a and b
  4. niether a nor b
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 energy possessed by an oscillating pendulum of a clock is
  1. kinetic energy
  2. potential energy
  3. restoring energy.
  4. mechanical energy
The gravitational potential energy of an object is due to
  1. its mass
  2. its acceleration due to gravity
  3. its height above the earth’s surface
  4. all of above
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