A uranium atom traveling with a velocity of 5.00 x 105 m s-1 relative to the containing tube breaks up into Krypton and Barium. The Krypton atom is ejected directly backwards at a velocity of
2.35 x 106 m s- relative to the barium after separation. With what velocity does the barium atom move
F:
forward relative to the tube? What is the velocity of the Krypton atom relative to the containing
tube?(mass of Kr = 95.0; Ba = 140; U = 235)
Ans: 1.45 x 106 m s-1, 9.0 x 105 m s-1​

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.