Pne8m0 stapler for c60rv rvm0k, k0m6ynir08vnny sk06v-g803dzh, Ukraine
Region:Ukraine (Сумы)
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Physics 8th grade, Ed. S. V. Gromov. Problem #109
"A branch fell into the lake. A deer running by managed to notice that the wave created by the fall of the branch reached the shore in 10 seconds, and the distance between adjacent wave crests was 10 cm, and in 2 seconds there were 4 splashes on the shore. Help the deer determine how far from the shore the branch fell."
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