Object A traveling east at 5 m/s collides with object B traveling west at 4 m/s. Object A has mass of 3 kg and object B has mass of 7 kg. The collsion takes place in one dimension, and is totally inelastic. Taking east to be positive, how do I find the volocity of object (A) after the colission.

You are sitting in a sled, at rest on a pond covered with nice, thick, frictionless ice. Your own mass is 94.9 kg, and the mass of the sled when empty is 13.0 kg. From shore, someone throws a baseball of mass 0.140 kg to you, and you catch it; the horizontal component of the ball s velocity is 32.1 m/s. What will be the sled s (and your) speed with respect to the surface of the pond after you catch the ball? 1 1.66 cm/s 2 4.16 cm/s 3 4.73 cm/s 4 34.2 cm/s

A marksman standing on a motionless railroad car fires a gun into the air at an angle of 30.00 °from the horizontal. The bullet has a speed of  175 m/s (relative to the ground) and a mass of  0.019 kg. The man and car move to the left at a speed of 1.5 ×10−3 m/s after he shoots. What is the mass of the man and car? Round the answer to two significant figures. [Hint: A component of a system's momentum along an axis is conserved if the net external force acting on the system has no component along that axis.] in Kg

An astronaut floating at rest in space has run out of fuel in her jetpack. She realizes that throwing tools from her toolkit in the opposite direction will help propel her back toward the space station. If the astronaut has a mass of 85 kg and she throws a hammer of mass 4.5 kg at a speed of 4 m/s, what will be the approximate resultant velocity that carries her back to the space station?