A stationary skateboarder I with a mass of 50 kg pushes a stationary skateboarder II with a mass of 75kg. After the push the skateboarder II moves with a velocity of 2 m/s to the right. What is the velocity of the skateboarder?

Alice has a mass of 62.0 kg and Bob has a mass of 84.0 kg and they are initially standing at rest with respect to one another on a frictionless surface. They push against each other such that Alice moves at 0.04 m/s relative to her starting point. With what speed does Bob move away from his initial position? a. 0.03 m/s b. 0.09 m/s c. 1.21 m/s d. 32.2 m/s e. 1.6 m/s

A block of mass m1 = 13.5 kg slides along a horizontal surface (with friction, μk = 0.31) a distance d = 2.3 m before striking a second block of mass m2 = 8.5 kg. The first block has an initial velocity of v = 9.5 m/s. a)Assuming that block one stops after it collides with block two, what is block two's velocity after impact in m/s?  b) How far does block two travel, d2 in meters, before coming to rest after the collision?

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?

One student pulls a car with 20 N to the East. Another student pulls the car with 30 N to the West. The car accelerates at 2 m/s² when the two students work together. What is the mass of the car (in kg)?

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/s

A dump truck is being filled with sand. The sand falls straight downward from rest from a height of 1.06 m above the truck bed, and the mass of sand that hits the truck per second is 62.4 kg/s. The truck is parked on the platform of a weight scale. By how much does the scale reading exceed the weight of the truck and sand? Number i Units

Alex Morgan, one of America's best forwards, kicks a 450. g soccer ball that was moving towards her at a speed of 12.0m/s, the impact caused the ball to leave her foot with a velocity of 20.0 m/s in the opposite direction. a. If the impact lasted for 0.250s, what force (magnitude and direction) did Alex exert on the soccer ball? b. What is one thing that she could do to make the soccer ball have a larger change in momentum?

An amusement park features a set of light railcars, currently resting on a straight, level section of track. Each railcar has a mass of 18 kg. Ellen and her younger brother Tim are seated in two of these railcars, which are initially at rest with the rubber buffers just touching each other. Ellen's mass is 42 kg, while Tim's mass is 32 kg. Ellen pushes Tim's railcar so that it moves away with a speed of 3.0 m/s relative to the track. Assuming that the frictional forces on the railcars are small, how far the railcars will have travelled after 2.0 s?