1- A 7.10 kg particle is subject to a net force that varies with position as shown in the figure. The particle starts moving at x = 0, very nearly from rest.
What is its speed at the following positions?
(a) x = 5.00 m
(b) x = 10.0 m
(c) x = 15.0 m
2- The ball launcher in a pinball machine has a spring that has a force constant of 1.20 N/cm. The surface on which the ball moves is inclined 10.0° with respect to the horizontal. If the spring is initially compressed 4.50cm, find the launching speed of a 100 g ball after the plunger is released and fully extended. Friction and the mass of the plunger are negligible.
