Two young children face each other standing on roller skates. If the first child (mass of 40kg) pushes off from the second child (mass of 30kg) to the right with a speed of 4 m/s, what is the speed and direction of the Second child? (Ans= 5.3 m/s in the opposite direction)
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- A 35.0 kg boy and 28.0 kg girl stand, on frictionless ice, at the center of an ice skating rink. The girl pushes the boy away. How far apart are they after boy has slid 4.0 m from the center of the rink?suppose that car 1 has a mass of 0.301+-0.0001kg, and initial speed of 2.12+-0.03 m/s in the positive x direction. car 2 of mass 0.305+-0.0001kg is initially stationary. the two cars collide. after the collision, car 1 comes to a stop, and car 2 has a speed of 1.97+-0.02 m/s in the positive x direction. calculate the total initial kinetic energy of the two car system with uncertainty.A 1400 kg car moving at 21 m/s runs into a 1200 kg car mobing in the same direction at 14 m/s. The two Cars lock together, and both drivers inmediately apply their brakes. If the cars comes to rest in 18 m, what is the coefficient of friction between the car's tires and the road?
- A 59.5 kg man standing on a frictionless surface pushes two large boxes in opposite directions as shown. Initially everything is a rest. If the left box has mass 41.5 kg and final speed 3.25 m/s, and the right box has mass 27.0 kg and final speed 2.00 m/s, what is the final velocity (magnitude and direction) of the man? Let the positive direction be to the right.Albert and his friend Isaac are standing in the middle of a sheet of ice in the student parking lot when they decide to give each other a push. If Albert has a mass of 73.6 kg and moves to the right at 1.30 m/s after the push, how fast will Isaac move if his mass is 51.8 kg? m/sA woman weighing 57.1 kg stands at one end of a 120-kg raft that is 6.00 m long. The other end of the raft is 0.500 m from a pier. So, before the woman moves, she is at a total distance of 6.50 m away from the pier. The woman walks toward the pier until she gets to the other end of the uniform raft and stops there. What is the distance between the uniform raft and the pier?
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