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1, , te, , _ $1 unit of work is, , (a) newton (b) newton-second (c) joule (d) xg, _ A force of 7 N acts on an object so that the object is displaced through 8 m in the direction of force. Work éo-:, by the force is, (a) -56] (b) 56 J (0 65) a, Work done by a force on an object is positive. The angle between the force and displacement of the object is, (a) 0° (6) 45° (c) 90° (@) 180°, Work done by a force on an object is negative. The angle between the force and displacement of the object is, (a) 0° (b) 45° (c) 90° (d) 180°, . Work done is zero, when, (a) force and displacement of the body are in the same direction., (b) force and displacement of the body are in the opposite direction., (0) force acting on the body is perpendicular to the direction of the displacement of the body., (d) none of these., . Work done by the force of gravity, when a body is lifted to height 4 above the ground is, (a) zero (b) positive (c) negative, , (d) none of these., , ig erm ole a kee eee