A(n) 6.2 kg object moving at 4.2 m/s eastward has a one-dimensional elastic collision with a(n) 6 kg object moving at 6.9 m/s in the opposite direction. what is the total kinetic energy of the twomass system after the collision? answer in units of j.

What determines the amount of inertia an object has

Why do astronauts in the space shuttle weigh less?

Atank has a shape of a cone with a radius at the top of 2 m and a height of 5 m. the tank also has a 1 m spout at the top of the tank. the tank is filled with water up to a height of 2 m. find the work needed to pump all the water out the top of the spout. (use 9.8 m/s2 for g and the fact that the density of water is 1000 kg/m3.)