As a 1150 kg truck travels up a 16.6 m high hill, the nonconservative forces of friction and the force generated by the engine do work on the truck. If the work done by friction is -3.23 x 10⁵ J,
(a) Work done by the engine is positive
(b) Work done by the engine is negative
(c) Work done by the engine is zero
(d) Work done by the engine cannot be determined from the given information