If a shell fired from a cannon explodes in mid air, its total

Options :
  1. momentum increases
  2. momentum decreases
  3. kinetic energy increases
  4. None of the above
Answer and Explanation :-

Answer: Option 3


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By: pradyumna On: Nov/27/2013

Some energy is produced in the

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By: mekibul On: Jan/03/2016

According to Newton''s second law of motion when the mass of a moving object decreases , then a force is genereted. Numerically, F= v dm/dt.
When a shell is explode from a canon the mass of the shell decreases. As a result a force is produced which accelerate the shell( F= ma . another form of Newton''s second law). When the shell accelerate its velocity gradually increases and therefore K.E(.= 1/2 mv*2 ) also increases. Similar principle is used in rocket propulsion.

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One might be led to question whether the scientists acted wisely in presenting the statesmen of the world with this appalling problem. Actually there was no choice. Once basic knowledge is acquired, any attempt at preventing its fruition would be as futile as hoping to stop the earth from revolving around the sun. Enrico Fermi, Collected Papers of Enrico Fermi: The United States,