Class XI

A light and heavy body have equal momenta. Which one has greater kinetic energy?
  1. the light body
  2. the heavy body
  3. both have same K.E
  4. none of these
A body of mass 3 kg is dropped from the height of 1m. The kinetic energy of the body will be when it touches the ground
  1. 29.4 N
  2. 29.4 N
  3. 29.4 J
  4. 150 J
A bolt of mass 0.3 kg falls from the ceiling of an elevator moving down with an uniform speed of 7 m/s. It hits the floor of the elevator (length of the elevator = 3 m) and does not rebound. What is the heat produced by the impact ?
  1. 8.82 J
  2. 8.42 J
  3. 9.22 J
  4. 8.11 J
Consider a collision between two pool balls. Ball 1 is at rest and ball 2 is moving towards it with a speed of 2 m s−1s−1. The mass of each ball is 0.3 kg. After the balls collide elastically, ball 2 comes to an immediate stop and ball 1 moves off. What is the final velocity of ball 1 ?
  1. 1.87 m/s
  2. 2.2 m/s
  3. 2 m/s
  4. 2.4 m/s
mass and energy are equivalent and are related by
  1. E = mc2
  2. E = 2mc2
  3. E = mc2/2
  4. E = mc3
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