An ideal incompressible fluid flows at 12 m/s in a horizontal pipe. if the pipe widens to twice its original radius, what is the flow speed in the wider section?
a) 4 m/sb) 6 m/sc) 12 m/sd) 3 m/s

Abumper car with a mass of 250 kg is traveling at a speed of 4 m/s. this bumper car collides and sticks to a second bumper car with a mass of 250 kg, which is initially at rest. what is the final speed of these two bumper cars after the collision, assuming they remain stuck together?