70.
REASONING
The only horizontal force acting on the boat and trailer is the tension
in the hitch; therefore, it is the net force. According to Newton’s second law, the
tension (or the net force) equals the mass times the acceleration. The mass is known,
and the acceleration can be found by applying an appropriate equation of kinematics
from Chapter 3.
SOLUTION
Assume that the boat and trailer are moving in the +
x
direction.
Newton’s second law is
x
x
F
ma
Σ
=
(see Equation 4.2a), where the net force is just
the tension +
T
in the hitch, so
x
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 Spring '08
 SOFFER
 Force, Mass, net force

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