In a demolition derby, a car of mass M kg and velocity 5.72 m/s crashes into a car of mass 2112.41 kg that was stalled on the track. After the collision, the two cars move down the track, stuck together, at a velocity 1.85 m/s. What was the mass M, in kg, of the car that was initially moving. a. 3100 b.1000 c. 2300 d. 750

2. A cart of mass 300 g moving along a straight track hits a 500 g cart which had been sitting still. After the carts hit, the 300 g cart has a speed of 1.0 m/s back to where it came from, while the 500 g cart is moving forward at 3.0 m/s in the same direction as the 300 g cart had been going at the beginning. How fast was the 300 g cart going before it hit the 500 g cart?

A 7400 kg truck traveling along a straight road at 14 m/s comes to a stop and remains stationary for several minutes. It then accelerates backward in reverse until it reaches 5.0 m/s in the opposite direction. What is the magnitude of the change in momentum of the truck for this entire process? A. 100,000 kg. m/s B. 140,000 kg. m/s C. 67,000 kgm/s D. 37,000 kgm/s O C O B OD O A

The table below shows data about the density and the speed of sound in some materials. Calculate the acoustic impedance of Blood and Muscle. Calculate the proportion of the ultrasound that is transmitted when ultrasound is incident on the boundary between Blood and Muscle. An ultrasound probe transmits a pulse of ultrasound of frequency, fo = 000 MHz. The reflected signal is found to have a frequency fr = 11.005 MHz.  The speed of sound in tissue is 1450 ms-1 and the angle between the probe and the artery is 40°.

18. If car A has a greater momentum than car B, what will happen to both vehicles immediately after they collide? A. They will travel to the right. B. They will travel to the left. C. They will stop immediately. D. It cannot be determined from this information. 19. If both cars are travelling the same speed and car B has a greater mass, what will happen to both vehicles after they collide? A. They will travel to the right. B. They will travel to the left. C. They will stop immediately. D. It cannot be determined from this information.

Dr. Knotts's kids are chasing each other through the yard. Arlo is in the lead and Greyson is chasing him from behind. Arlo has a mass of 13.1 kg and is running at 1.06 m S After they run into each other, Greyson has a velocity of 1.14 19.6 kg and is running in the same direction at 1.44 How fast is Arlo moving just after they collide? VArlo m S What is the total kinetic energy of the system before the collision? KEinitial J = What is the total kinetic energy of the system after the collision? KEfinal J = Is this collision considered eleastic, inelastic, or both? O Inelastic Both Elastic m S m S in the same direction he was already moving. I I Greyson has a mass of

5. What is the momentum (as a function of time) of a 5.0-kg particle moving with a velocity (v¯ (t) = 2.0i + 4.0tj) m/s? What is the net force acting on this particle?