Two figure skaters are standing motionless on the rink when they push off each other. The first skater has a mass of 80 kg and a final velocity 3 m/s. If the second skater has a final velocity of -8.4 m/s, what is her mass?

A 47.0 kg boy stands on a sled that is stopped in the middle of a frozen pond. The boy jumps horizontally off the sled with a velocity of 2.40 m/s. The sled moves in the opposite direction with a velocity of −11.1 m/s. What is the mass of the sled?

An old Chrysler with mass 2400 kg is moving along a straight stretch of road at 80 km/h. It is followed by a Ford with mass 1600 kg moving at 60 km/h. How fast is the center of mass of the two cars moving?

Two ice skaters stand facing each other at rest on a frozen pond. They push off against one another and the 48 kg skater acquires a speed of 0.69 m/s. If the other skater acquires a speed of 0.86 m/s, what is her mass in kilograms?

Two ice skaters, initially at rest, push off each other in opposite directions. The skater labeled “A" has a mass of 55 kg and moves to the left at a speed of 4.6 m/s. After the push, how fast does the skater labeled “B" travel? Skater “B" has a mass of 68 kg.

Standing and facing each other, two hockey players push off and move in opposite directions. The second player, of mass m₂ = 58 kg, acquires a speed of v2 = 0.32 m/s. Find the speed of first player if m₁ = 25 kg. V1 = m/s

Two 2712 kg train cars roll toward each other (Car A at 0.34 m/s, Car B at -2.5 m/s) on a level track. After they collide and couple together, what is the final velocity of the two-car object?

A 72-kg boy and a 48- kg girl, both wearing ice skates face each other at rest on a skating rink. The boy pushes the girl, sending her eastward with a speed of 6.8m / s . What is the speed and direction of the boy?

After skiding down a snow-covered hill on an inner tube, Ashley is coasting across a level snowfield at a constant velocity of +2.6 m/s. Miranda runs after her at a velocity of +4.5 m/s and hops on the inner tube. How fast do the two of them slide across the snow together on the inner tube? Ashley's mass is 54 kg, and Miranda's is 52 kg. Ignore the mass of the inner tube and any friction between the inner tube and the snow.

A 0.19 kg arrow is shot at +42 m/s. It hits an apple (m = 0.62 kg), and goes through the apple, leaving with a velocity of +23 m/s.What is the velocity of the apple after the arrow leaves it?