Gayle runs at a speed of 4.00 m/s and dives on a sled, initially atrest on the top of a frictionless, snow-covered hill. aftershe has descended a vertical distance of 5.00m, her brother, who isinitially at rest, hops on her back, and they continue down thehill together.
gayle's mass is 50.0kg, the sled's mass is 5.00kg and her brotherhas a mass of 30.0kg.

what is their speed at the bottom of the hill if the total verticaldrop is 15.0m?

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.

What about pink because im not too fond of red

The figure is missing but we can answer anyway.the correct answer is "releasing the string". in fact, when the person is holding the bow and the arrow, the kinetic energy of the arrow is still zero (because the arrow is not moving). the moment the arrow is released, it acquires a velocity v, so its kinetic energy will become different from zero: where m is the mass of the arrow and v its velocity.  all the other options, instead, do not increase the kinetic energy of the system: -  pulling farther back on the string : this will just increase the elastic potential energy of the system-  holding the arrow higher: this will increase the gravitational potential energy of the system (which is given by u=mgh, where h is the height above the ground)-  decreasing the mass of the arrow: this will decrease the gravitational potential energy of the system (which is given by u=mgh, where m is the mass)