An object experiences no acceleration. Which of the following
cannot be true for the object? (a) A single force acts on the object. (b) No forces
act on the object. (c) Forces act on the object, but the forces cancel.
Q uick Quiz 5.3 You push an object, initially at rest, across a frictionless floor
with a constant force for a time interval Dt, resulting in a final speed of v for
the object. You then repeat the experiment, but with a force that is twice as
large. What time interval is now required to reach the same final speed v?
(a) 4 Dt (b) 2 Dt (c) Dt (d) Dt/2 (e) Dt/4
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