A billiard ball of mass 1.5 kg is moving in the +y-direction at 2.0 m/s and collides with a second billiard ball of mass 2.5 kg moving along in the –x-direction at 2.2 m/s. They collide. After the collision, the 1.5 kg ball moves at an angle of 50 degrees below the –x-axis and the 2.5 kg ball moves at an angle of 40 degrees above the –x-axis. Find the speed of each ball after the collision.

in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

a.   mass number from atomic number