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When a cannon shell explodes in mid air,...

When a cannon shell explodes in mid air, then identify the incorrect statement

A

(a) the momentum of the system is conserved at the time of explosion

B

(b) the kinetic energy of the system always increases

C

(c) the trajectory of centre of mass remains unchanged

D

(d) None of the above

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The correct Answer is:
B
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DC PANDEY-CENTRE OF MASS, LINEAR MOMENTUM AND COLLISION-Level 1 Objective
  1. When two blocks connected by a spring move towards each other under mu...

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  2. If two balls collide in air while moving vertically, then momentum of ...

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  3. When a cannon shell explodes in mid air, then identify the incorrect s...

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  4. In an inelastic collision

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  5. The momentum of a system is defined

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  6. The momentum of a system with respect to centre of mass

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  7. Three identical particles are located at the vertices of an equilatera...

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  8. The average resisting force that must act on 5kg mass to reduce its sp...

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  9. In a carbon monoxide molecule, the carbon and the oxygen atoms are sep...

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  10. A bomb of mass 9kg explodes into two pieces of masses 3kg and 6kg. The...

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  11. A heavy ball moving with speed v collides with a tiny ball. The collis...

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  12. A loaded 20,000kg coal wagon is moving on a level track at 6ms^-1. Sud...

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  13. A machine gun fires a bullet of mass 40 g with a velocity 1200 ms^-1. ...

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  14. A projectile of mass m is fired with a velocity v from point P at an a...

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  15. A ball after freely falling from a height of 4.9m strikes a horizontal...

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  16. The centre of mass of a non uniform rod of length L, whose mass per un...

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  17. A boat of length 10m and mass 450kg is floating without motion in stil...

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  18. A man of mass M stands at one end of a stationary plank of length L, l...

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  19. A ball of mass m moving at a speed v collides with another ball of mas...

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  20. A particle of mass m moving with velocity u makes an elastic one-dimen...

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