A black ball of mass 2kg moving at velocity of 10 m/sec collides with a stationary white ball of mass 3kg find their common velocity if they stick together after collision?

4 m/s

Explanation:

here

mass of black ball (m1) = 2 kg

initial velocity of black ball (u1) = 10 m/s

mass of white ball (m2) = 3 kg

since white ball is stationary so initial velocity of white ball (u2) = 0 m/s

let v be the common velocity then

by the principle of linear momentum

linear momentum before collision = linear momentum after collision

or, m1u1 + m2u2 = (m1+m2)v [becoz they have common velocity v after collision]

or, v = (m1u1 + m2u2)/m1+m2

or, v = (2*10 + 0)/2+3

or, v = 20/5

~ v = 4 m/s

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