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Q.

In the head on elastic collision of a heavy vehicle moving with a velocity of  10 ms-1 and a small stone at rest, the stone will fly away with a velocity equal to

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a

10 ms-1

b

20 ms-1

c

40 ms1

d

5 ms-1

answer is C.

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Detailed Solution

detailed_solution_thumbnail

If m1>>m2 Then v1≈u1 and v2=2u1-u2 

v2=2u1-0=2×10=20 m/s

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