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SAT® Subject Test in Physics

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Moderate

Work and KE

SATPHY-FE9XG1

Fifteen joules of work is done on object $A$ (at rest), all of which goes into changing its kinetic energy. Sixty joules of work is done on object $B$ (at rest and with the same mass as object $A$), all of which goes into changing its kinetic energy.

How does the speed of object $B$ compare to the speed of object $A$ after this work is done?

A

The speed of object $B$ is four times as much as the speed of object $A$.

B

The speed of object $B$ is sixteen times as much as the speed of object $A$.

C

The speed of object $B$ is two times as much as the speed of object $A$.

D

The speed of object $B$ is less than two times as much as the speed of object $A$ (but not the same as).

E

The speed of object $B$ is the same as the speed of object $A$.