Question

QUESTION 1 Two skaters, one of mass 80 kg, the other of mass 40 kg, are standing next to each other on frictionless ice rink. The 40 kg skater pushes the 80 kg skater. After the push, the 80 kg skater is going at 1 m/s. How fast and in what direction is the 40 kg skater going after the push? (HINT: use the fact that since there are no external forces, the velocity of the center of mass of the two skaters is the same after the push as it was before the push.) A. 1 m/s in the opposite direction compared to the 80 kg skater B. 2 m/s in the same direction as the 80 kg skater OC. The 40kg skater did the pushing, so she doesn't move D. 2 m/s in the opposite direction compared to the 80 kg skater QUESTION 2 A 1000 kg car and a 3000 kg truck are at positions x 0 and x-5m at time t-0. The car is moving at 5 m/s in +x direction, while the truck is moving at 2 m/s in the x direction. What are the position and velocity of the car-truck system's center of mass at t-0? A. Xcom"2.5 m and vcom-3.5 m/s o B. Xcom-3.75 m and vcom-1.75 m/s O C. Xcom-3.75 m and vcom-0.25 m/s D. Xcom 2.5 m and vcom-1.5 m/s

Answer 1