Question

M1 = 5kg

M2 = 2kg

u1 = 15 m/s

u2 = 25 m /s

find v1 and v2 ?​

Answer 1

m1u1 + m2u2 = m1v1 + m2v2

5 * 15 + 2* 25 = 5v1 + 2*v2

30 + 50 = 5v1 + 2v2

5v1 + 2v2 = 80---------(1)

now considering it to be ellastic collision

e = (v2 - v1) / (u1-u2)

e= 1 in elastic collision

therefore

15 - 25 = v2 - v1

v2 - v1 = -10

and 10 = v1 - v2-----(2)

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2 eq aa gyi 2 variables

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