Dr. Jekyll (m = 70kg) is riding a skateboard when he realizes the cranberry juice he’s drinking is sweetened with artificial sweetener and turns into Mr. Hyde (m = 155kg). If Dr. Jekyll was initially moving at 6.5m/s, what is Mr. Hyde’s speed? (assume no external forces act)

A 1000kg car is traveling 20m/s to the right when it collides head-on with a 1700kg pickup truck traveling 16m/s to the left. The vehicles lock together inelastically following the collision, which lasts 0.4s. What direction did the vehicles move after the collision? Car (initial) Truck (initial) Combined (final) Car only (final) Truck only (final) How fast were the vehicles moving after the collision? unit What was the magnitude of the impulse? unit What was the magnitude of the impact force? unit |pl unit |||

You and another astronaut are in space.  You throw a tool to them that has a mass of 15kg.  Your mass is 91kg and the other astronaut's mass is 88kg. Initially you and the other astronaut are at rest.  You threw the tool at a speed of 8m/s.  What is your velocity after you threw the tool?

60. 60. An object can only move along a straight, level path. The graphs below show the position x of the object plotted as a function of time t. The net force on the object is zero in which of the cases?