After rolling halfway down an incline a marble's kinetic energy is A. impossible to determine
B. the same as its potential energy
C. greater than its potential energy
D. less than its potential energy

Can somebody explain to me how newton's 3rd law relates to momentum? ~ap physics 1

The crank oa rotates in the vertical plane with a constant clockwise angular velocity ω0 of 5.6 rad/s. for the position where oa is horizontal, calculate the force under the light roller b of the 10.6-kg slender bar ab.

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e