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a massive ball moving with a speed v collides head on with a fine ball having mass very much smaller than the mass of first ball at rest.the collision is elastic and then immediately after the impact the second ball will move with a speed approx equal to??? use formula v2=2m1/m1+m2*ui+2m2/m1+m2*u2

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We apply the conservation of linear momentum and also the conservation of kinetic energy principle. The collision is completely elastic so there is no loss of energy here.

let m1 > m2. u1 = v u2 = 0 and v1 and v2 are the speeds after collision. The balls are colliding head on, so the velocities are all along one axis/straight line.

Divide (4) by (2): Let v ≠ v1 v + v1 = v2 substituting this in equation (2), we get: m1 (v - v1) = m2 (v + v1) v1 = (m1 - m2) v / (m1 +m2) --- (5) v2 = 2 m1 v /(m1 + m2) -- (6)