An object of mass m = 5.00 kg, attached to a spring scale, rests on a frictionless, horizontal surface as shown in Figure. The spring scale, attached to the front end of a boxcar, reads zero when the car is at rest. (a) Determine the acceleration of the car if the spring scale has a constant reading of 18.0 N when the car is in motion. (b) What constant reading will the spring scale show if the car moves with constant velocity? Describe the forces on the object as observed (c) by someone in the car and (d) by someone at rest outside the car.

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Q: An object of mass m = 5.05 kg, attached to a spring scale, rests on a frictionless, horizontal…

A: Mass, m = 5.05 kg Constant reading, F = 17.2 N

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Q: In the figure, blocks A and B have weights of 47 N and 22 N, respectively. (a) Determine the minimum…

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A: Given that:

Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”