Class XI

Two billiard balls each of mass 0.05 kg moving in opposite directions with speed 6 m s−1s−1 collide and rebound with the same speed. What is the impulse imparted to each ball due to the other ?
  1. 0.5 kg m s−1
  2. 0.3 kg m s−1
  3. 0.6 kg m s−1
  4. 0.4 kg m s−1
A man of mass 70 kg stands on a weighing scale in a lift which is moving downwards with a uniform acceleration of 5 m s−2s−2 what would be the reading on the scale?
  1. 45 Kg
  2. 35 kg
  3. 53 kg
  4. 35 kg
A train moving with a uniform speed of 54 kmph. What is its speed in m/s ?
  1. 15 m/s
  2. 1.5 m/s
  3. 9 m/s
  4. 90 m/s
A batsman deflects a ball by an angle of 45∘∘ without changing its initial speed which is equal to 54 km/h. What is the impulse imparted to the ball? (Mass of the ball is 0.15 kg.)
  1. 4.6 kg m s−1
  2. 4.2 kg m s−1
  3. 4.4 kg m s−1
  4. 4.8 kg m s−1
A shell of mass 0.020 kg is fired by a gun of mass 100 kg. If the muzzle speed of the shell is 80 m s−1s−1, what is the recoil speed of the gun?
  1. 1.9 cm/s
  2. 1.7 cm/s
  3. 1.8 cm/s
  4. 1.6 cm s-1
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