Question

*100 points*

Answer 1

The speed of the green ball after the collision will be "1 m/s".

According to the question,

Before collision,

Mass,

• $m_1=m_2 = 0.15 \ kg$

Speed,

• $u_1 = 3 \ m/s$
• $u_2 = -2 \ m/s$

Let,

• Blue ball moving in (+) axis.
• Green ball moving in (-) axis.
• After collision, the final velocity of blue ball be "$v_1$".

then, $v_2 =0$

The momentum conversion will be:

→ $m_1 u_1 +m_2 u_2 = m_1 v_1$

→                   $v_1 = u_1 +u_2...(m_1=m_2)$

→                   $v_1 = 3 -2$

→                   $v_1 = 1 \ m/s$ (Speed of green ball)

Thus the above answer is correct.    

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