Two forces, one four times as large as the other, pull in the same direction on a 10kg mass and impart to it an acceleration of 2.5 m/s2. If the smaller force is removed, what is the acceleration of the mass?

The acceleration of the mass is 2 meters per square second.

Explanation:

By Newton's second law, we know that force (), measured in newtons, is the product of mass (), measured in kilograms, and net acceleration (), measured in meters per square second. That is:

(1)

The initial force applied in the mass is:

In addition, we know that force is directly proportional to acceleration. If the smaller force is removed, then the initial force is reduced to of the initial force. The acceleration of the mass is:

The acceleration of the mass is 2 meters per square second.

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.