Question

two blocks are initially at rest on a frictionless, horizontal surface. The mass mA of block A is less than the mass mB of block B (mA<mB). you pull both blocks the same distance d along a straight line using the same constant force F. Which of the following statements comparing the kinetic energies of the blocks KA and KB, when they have gone the distance d is correct? a. Kinetic energy of each block is the same KA= KB b. KA>KB because mA<mB so that block A achieves greater speed c. KB>KA because block B has greater mass d. There is not enough information to answer because the masses are unknown e. There is not enough information to answer because the magnitude of the force F is not given

          two blocks are initially at rest on a frictionless, horizontal surface. The mass mA of block A is less than the mass mB of block B (mA<mB). you pull both blocks the same distance d along a straight line using the same constant force F.  Which of the following statements comparing the kinetic energies of the blocks KA and KB, when they have gone the distance d is correct?
a.  Kinetic energy of each block is the same KA= KB
b.  KA>KB because mA<mB so that block A achieves greater speed
c.  KB>KA because block B has greater mass
d.  There is not enough information to answer because the masses are unknown
e.  There is not enough information to answer because the magnitude of the force F is not given

Added by Hien T.

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