2. A block of mass \( M=0.5 \mathrm{~kg} \) is attached to an ideal massless spring with a force constant of \( k=10 \mathrm{~N} / \mathrm{m} \). The block is pulled a distance of 10 cm from the equilibrium position of the spring, and the block is released at rest from there. The system then undergoes simple harmonic motion. A) What is the angular frequency \( w \) of the spring-mass system?

Dados los vectores \( \vec{P}=(1 \hat{i}-2 \hat{j}) m \) y \( \vec{Q}=(-9 \hat{i}+20 \hat{j}) m \), el vector resultante de la suma \( \vec{P}+\vec{Q} \) es:

Una pesante maniglia in ottone ha una massa di \( 3,40 \mathrm{~kg} \). Quale volume in \( \mathrm{cm}^{3} \) occupa la maniglia? La densità dell'ottone è \( 8,40 \cdot 10^{3} \mathrm{~kg} / \mathrm{m}^{3} \).

f Steve throws the football 50 meters in 3 seconds, what is the average speed of the football? (nearest hundredth) If it takes Ashley 3 seconds to run from the batters box to first base at an average spe of 6.5 meters per second, what is the distance she covers in that time? \( \begin{array}{l}\text { Bart ran } 5000 \text { meters from the cops and an average speed of } 8 \text { meters/second before } \\ \text { he got caught. How long did he run? }\end{array} \)

What will happen to the speed of a ball after it is thrown upward into the air? \( \begin{array}{ll}\text { A. Increnses } & \text { C. increases and then d }\end{array} \)

1. A 0.500 g (small) mass on the end of a 1.70 m long string is pulled aside \( 20^{\circ} \) from the vertical and shoved downward (toward the bottom of its motion) with a speed of \( 2.4 \mathrm{~m} / \mathrm{s} \). (a) Is the angle on the other side greater than, less than, or the same as the angle on the initial side \( \left(20^{\circ}\right) \) ? Explain in terms of energy. (5pts) (b) Calculate the angle it goes to on the other side, neglecting air resistance. ( 10 pts )