Two hockey pucks are initially at rest on a horizontal plane of frictionless ice. Puck A has twice the mass of puck B. Suppose we exert a constant force on puck A until it has travelled 2 m from its starting position. We exert a force of the same magnitude on puck B until it has travelled 1 m from its starting position. How do the pucks’ kinetic energies compare when we stop pushing them?
A. KA = 4KB
B. KA = 2KB
C. KA = KB
D. KB = 2KA
E. KB = 4KA
F. Some other relationship (specify)
B. KA = 2KB
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and
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vectors and
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