A metal ball of mass 2 kg moving with speed of 36km/h is having a collision with a stationary ball of mass 3kg. If after collision, both the balls move together, the loss in kinetic energy due to collision is 
 

  • Option 1)

    80 J 

  • Option 2)

    40 J 

  • Option 3)

    60 J 

  • Option 4)

    160 J

 

Answers (1)

As we discussed in concept

If only conservative forces act on a system, total mechnical energy remains constant -

K+U=E\left ( constant \right )

\Delta K+\Delta U=0

\Delta K=-\Delta U

-

 

 \Delta k=\frac{1}{2}(\frac{m_{1}m_{2}}{m_{1}+m_{2}})u_{1}^{2}

on putting the value we get 60J


Option 1)

80 J 

Option is incorrect

Option 2)

40 J 

Option is incorrect

Option 3)

60 J 

Option is correct

Option 4)

160 J

Option is incorrect

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