Two balls of masses 2kg and 4kg after the collision are moving with speeds 4m/s and 2m/s as shown in figure. Find the impulse of reformation for the 4kg ball.
A
4N-s
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B
2N-s
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C
8N-s
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D
1N-s
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Solution
The correct option is C8N-s
Let v be the common velocity at the time of maximum deformation. Applying linear momentum conservation principle (taking rightward +ve): (m1+m2)v=m1v1+m2v2 (2+4)v=2×(−4)+4×(2)=0 ⇒v=0 Impulse of reformation: JR= change in momentum of any body during reformation ∴JR=m2(v2−v)=4(2−0)=8N-s