Ameter stick flies by with an apparent length of 60 cm. what is it's velocity in m/s? not sure which formula to use

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

The rocket is fired vertically and tracked by the radar station shown. when θ reaches 66°, other corresponding measurements give the values r = 32700 ft, r¨ = 85 ft/sec2, and θ˙ = 0.019 rad/sec. calculate the magnitudes of the velocity and acceleration of the rocket at this position.