During a spacewalk, Dmitri finds himself floating 3 m from his space station's airlock. He only has one minute of air left. He has one detachable 10 kg toolkit, which he can toss to propel himself toward safety. How fast will he need to move to reach the airlock before he runs out of air?

An 96kg  diver inhales to have a body density of 950 kg/m3, then swims to the bottom of a shallow sea (sea water density = 1024 kg/m3) and begins to float to the surface.  What is his acceleration? (g=9.8 m/s2)

The Hulk (200kg of pure angry muscle)collides head-on with a truck (2500kg). If the Hulk was running at 10.0m/s and the truck was moving at 15.0 m/s in the opposite direction, after they stick together, what is their speed (in m/s)? Either the Hulk or the truck needs a negative initial velocity.

Students are given two spherical balls made of different materials, but of identical mass and diameter to experiment with. Each ball is dropped from an initial height, h0. The “sad ball” comes to rest without visibly bouncing when it strikes the tabletop. The “happy ball” bounces up to a final height h, where h<h0 A fellow student wants to use one of the balls in a carnival game where cups are knocked over by a thrown ball. Which ball should they use, happy or sad?  In a clear, coherent, paragraph-length response that may also contain figures and/or equations, explain what physics principles explain why the happy ball bounces higher off of the tabletop and explain which ball makes the better choice as a projectile in the carnival game. COMPLETE THE TABLE BELOW A Answer the Question   B Basic Physics   C Cite Information   D Draw it all together