answer is 1st option plzzz i will mark brainliest to genius.....
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let x distance plank moves
apply conservation of linear momentum
40( 10 - x) = 20x
400 -40x= 20x
400 = 60x
x= 20/3
velocity = 20/3.2
= 20/6
= 10/3
apply conservation of linear momentum
40( 10 - x) = 20x
400 -40x= 20x
400 = 60x
x= 20/3
velocity = 20/3.2
= 20/6
= 10/3
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