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Ball A of mass 50 gm and speed 10 m/s collides with other ball B of mass 10gm and speed 15m/s travelling in opposite direction with each other. Determine the final speed of ball B. If the coefficient of restitution is $\frac{2}{5}$ .

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$\frac{40}{3} m / s$

$\frac{75}{3} m / s$

$\frac{91}{8} m / s$

$\frac{85}{6} m / s$

answer is D.

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Detailed Solution

$v_{B} = \frac{m_{A} (1 + e)}{m_{A} - m_{B}} μ_{A} - \frac{m_{B} - e m_{A}}{m_{A} + m_{B}} μ_{B}$

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