Which of the following best expresses explicitly that simon and hillary worked together to save the little boy? "hey kid," hillary called, "it's ok. don't worry. we'll you." together, they the little boy onto hillary's board and the trio paddled toward the beach. simon and hilary told reporters that they had heard a horn as they reached the raft. coast guard members swam to meet them.

Together, they helped the little boy onto Hillary's board and the trio paddled toward the beach.

Explanation:

This is the only sentence that says that Hillary and Simon helped the little boy, and explains how they helped him by getting the little boy onto Hillary's board. It's explicit in its description of what happened.

ek = (m·v2) / 2

v - velocity of system after the collision

m = m1 + m2

ek = (m1 + m2) ·v2/2

ek = (200 + 250) ·2,32/2 = 450·5,29/2 = 1190,25 j

i don't know the answer