Homework Help: ap physics

Posted by annie on Sunday, November 14, 2010 at 8:48pm.

A 22.7 kg mass attached to a spring scale rests
on a smooth, horizontal surface. The spring
scale, attached to the front end of a boxcar,
reads T = 21.9 N when the car is in motion.
If the spring scale reads zero when the car
is at rest, determine the acceleration of the
car, when it is in motion.

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