1. A 44 kg boy on in-line skates is playing with a 22 kg exercise ball. Disregarding friction, explain what happens during the following situa- tions. a. The boy is holding the ball, and both are at rest. The boy then throws the ball horizontally, causing the boy to glide back at 3.5 m/s. b. Explain what happens to the ball in part (a) in terms of the momentum of the boy and the momentum of the ball. c. The boy is initially at rest. The boy then catches the ball, which is ini- tially moving to the right at 4.6 m/s. d. Explain what happens in part (c) in terins of the momentum of the boy and the momentum of the ball.

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

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