According to the the amount of energy in the universe doesn't change. a) law of energy transformation b) law of kinetic energy c) law of conservation of energy d) law of potential energy

since you're a real machine, your ama is always less than your ima, because you can never totally eliminate friction.

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west