A boat, with a mass of 150kg, stars at rest with an acceleration of +1.5 m/s2 when going in the same direction of the current and engine at its fullest. In a second experiment, the boat, with the same mass, departs from rest in the direction opposite to the current, also at full engine performance. In this second case the acceleration of -1.0m/s2. A Diagram follows.
Ignoring Friction
a) Draw the appropriate Free Body Diagrams
b) FindThe Force applied by the engine.
b) The Force of the current

II) When Friction is 20N, and Fboat and FCurrent are the same as in I.

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.

+15-35=-20

going in opposite directions