While quarantining, Mr. Johnston picked-up inline skating to fight boredom. One day, Mr. Johnston with a mass of 115 kg was standing in his driveway in his skates (at rest) when out of nowhere his son Emmit who pounsed on his back like a spider monkey. Emmit has a mass of 59 kg and was moving at a velocity of 5.5 m/s. Approximately how fast did Mr. Johnston begin to roll towards the street with Emmit clinging to his back? a
5.5 m/s
b
324.5 kg m/s
c
33 m/s
d
1.9 m/s

A10.0 kg cart and a 15kg cart are locked together with a compressed spring between them. they are then released so that the spring pushes the two carts apart. the 10.0 kg cart is moving at 4.5 m/s afterward. how fast is the 15kg cart moving? 3.0 m/s 2.0 m/s 4.5 m/s 5.0 m/s

Oxygen and hydrogen gas are at the same temperature t.what is the ratio of kinetic energies of oxygen molecule and hydrogen molecule if oxygen is 16 times heavier than hydrogen.

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.