# How to approach this kind of task about kinetic energy? [closed]

The bullet with mass $$m_{ball}=0.2 kg$$ travels with speed $$v=2 \frac{m}{s}$$ and hits Plasticine sphere with mass $$m_{sphere}=2.5 kg$$ and get stuck. I need to find the amount of heat ejected. How to approach this task? Probably it's about kinetic energy transforming to heat; and the law of conservation of momentum.

## closed as off-topic by jinawee, Brandon Enright, John Rennie, Kyle Kanos, user10851 Mar 13 '14 at 6:08

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The velocity of the system after collision is $$V=\frac{m_b}{m_b+m_s}v_b$$