Question

Tivo friends A and B each weighing 40 kg are
sitting on massless plank some distance d = 21
m apart, which is placed on smooth horizontal
surface. A rolls a ball of mass 4 kg on the plank
towards B which В catches. Find distance
moved by the plank -
(1) I m
(2) 2 m (3) 3 m (4) 4 m
de
se​

Answer 1

Answer:

sorry I don't know the answer

Explanation:

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