A VW beetle going 80 km/hr East, hits a Mack truck, 10 times the mass of the beetle, head on, going 60 km/hr West. They fuse into one mass. At what speed will they move off together?  In what direction? Will energy be conserved?

A rod with a mass of 5 kg and a length of 9 meters is at rest in space with its long side pointing in the y direction. Two 12 kg masses of clay hit the rod at the same time and with the same speed of 18 m/s. One was traveling in the x direction before hitting and sticking to the top of the rod, and the other was traveling in the -x direction before hitting and sticking to the bottom of the rod. What will the magnitude of the angular velocity of the rod be in radians per second?

The Tunguska meteor delivered 1.2E17 Joules of kinetic energy to the Earth’s atmosphere in an air-burst over Siberia in 1908. If its speed was 2.7E4 m/s, what would its mass have been?

An atomic bomb moving at 100.0 m/s explodes releasing 2.70*10^17J of energy. How massive was the bomb before it exploded. a) 333 kg   b) 33.3 kg   c) 30.0 kg   d) 3.33 kg   e) 3.00 kg