4) If you walk 5.0 m horizontally forward at a constant velocity carrying a 10 N

Question

4) If you walk 5.0 m horizontally forward at a constant velocity carrying a 10 N object, the amount of work you do is A) more than 50 J. B) equal to 50J C) less than 50 J, but more than 0J D) zero. 5) If the net work done on an object is positive, then the object's kinetic energy A) remains the same B) is zero. C) decreases. D) increases. E) cannot be determined without knowing the object mass. 6 A4.0 kg mass is moving with speed 2.0 m/s. A 1.0 kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stopping? A) the 4.0 kg mass B) the 1.0 kg mass C) Both travel the same distance D) Cannot be determined from the information given.

Explanation / Answer

4.OPTION : B is correct

WORK = FORCE X DISPLACEMENT = 10N X 5m = 50J  

5.option : D is correct

The work-energy principle states that an increase in the kinetic energy of a rigid body is caused by an equal amount of positive work done on the body by the resultant force acting on that body.

6. option : B

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