A small object with mass m = 0.0900 kg moves along the +x-axis. The only force on the object is a conservative force that has the potential-energy function U(x)=−αx2+βx3, where α= 7.50 J/m2 and β = 0.300 J/m3. The object is released from rest at small x. When the object is at x = 4.00 m, what are its

(a) speed and
(b) acceleration (magnitude and direction)?
(c) What is the maximum value of x reached by the object during its motion?

b

explanation:

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.

im srry but ur wrong the answer is d a smooth rock, some red dirt, and an empty bird's nest.