Worked Example - Lesson 10 Study the given problem and solution, then answer the

Question

Worked Example - Lesson 10 Study the given problem and solution, then answer the questions regarding the problem. 10 STATEMENT OF THE PROBLEM A 1- kg ball, m, collidés with a 3-kg ball, m, as shown. The balls have initial velocities of U 1 initial = 31 m/s and v, initial31 m/s. Immediately after the collision 2 inal 2im/s, what is ifinal V. i initial 2 initial m) ( STRATEGY Before This is a one-dimensional Conservation of Linear Momentum problem. To use the concept of conservation of momentum, weAfter must ensure that there is no net extemal V. V. Since 1) we V2 final s final are only interested in what happens immediately before and after the collision, and 2) the collision is brief, we can assume that any external forces acting on the balls m2 = 3 kg v,initial=-3 m/s m1 = 1 kg

Explanation / Answer

1

We know

Fexternal*time=change in momentum

if Fexternal=0

then change in momentum=0 so it momentum have to be conserved ,it is very important to check for net external force to be zero

(b) initial momentum=1*3-3*3=-6 kg.m/s

final momentum=1*(-12)+3*2=-12+6=-6 kgm/s

As clear ,momentum is conserved

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