A 250 kg cannon containing a cannonball is initially at rest. If the cannon shoots the 20 kg cannonball at 15 m/s, what is the magnitude of the recoil velocity of the cannon?

Amarble, a bowling ball, a basketball, and a baseball are rolling across the floor at 10 m/s. which one has the greatest kinetic energy? the marble the bowling ball the basketball the baseball

Match each type of lever with the correct diagram. 1. first-class 2. third-class 3. second-class

How does the strength of the electrostatic force between an electron and a proton compare to the strength of the gravitational force between them?