An observation of the red shift of galaxies suggests that the universe is a.. expanding.. b.. contracting.. c.. reversing..d.. stagnant..

An electron and a proton are held on an x axis, with the electron at x = + 1.000 m and the proton at x = - 1.000 m. part a how much work is required to bring an additional electron from infinity to the origin? express your answer with the appropriate units. part b if, instead of the second electron coming in from infinity, it is initially at x = + 20.00 m on the axis and is given an initial velocity of 100.0 m/s toward the origin, does it reach the origin? part c how close to the origin does it come?

What is the momentum of a 47-gram tennis ball that is traveling at 40 m/s

A0.25 kg arrow is moving at 5 m/s and hits a 0.10 kg apple. the apple sticks to the arrow, and both move to the right together. what is their velocity?