1. Describe the motion of a freely falling bodies. 2. A ball is thrown vertically upward with a velocity of \( 20 \mathrm{~m} / \mathrm{s} \) from the top of a building. The height of the point from where the ball is thrown is 25 m from the ground. (a) how high will the ball rise? (b) how long will it take for the ball to hit the ground? 3. A ball is dropped on the floor from a height of 10 m . It rebounds to a height of 2.5 m . If the ball is in contact with the floor for 0.01 sec , what is the average acceleration during contact? 4. If a stone is thrown vertically downward into a well with a speed of \( 10 \mathrm{~m} / \mathrm{s} \), how long will it take it to reach the water surface 60 m below?

Question 6/13An air tank is exposed to ambient temperature.If you set the air pressure of the tank to 35 psi for a leak test and find that 24 hours later the tank's pressure has increased, what could've happened?The tank leakedThe tank drew in additional airThe ambient temperature increasedThe ambient temperature decreased

body placed on a rough horizontal level \( W=75 \mathrm{~N} \) horizontal force affected 50 N Makes it about to move en the coefficient of friction equals \( \begin{array}{llll}\text { 1) } \frac{1}{3} & \text { 2) } \frac{2}{3} & \text { 3) } \frac{3}{4} & \text { 4) } \frac{1}{4}\end{array} \)

3) if \( \overrightarrow{F_{1}}, \overrightarrow{F_{2}}, \overrightarrow{F_{3}} \) are 3 forces that meets at a point and equilibrium: then the resultant of \( \overrightarrow{F_{1}}, \overrightarrow{F_{2}} \) equal : \( \begin{array}{lll}\text { 1) } \overrightarrow{F_{1}}, & \text { 2) } \overrightarrow{F_{1}}+\overrightarrow{F_{2}} & \text { 3) } \overrightarrow{F_{3}}\end{array} \)

Prequnta 3 (4 puntos) Calcular la variación de la energia interna de un bloque de hielo de 520 g que se se encuentra \( 0{ }^{\circ} \mathrm{C} \) y a presionn atmostérica, so funde y luego se calienta a \( 4{ }^{\circ} \mathrm{C} \). Densidad del hielo \( 0.917 \mathrm{~g} / \mathrm{cm}^{3} \), calor latente de fusión \( 3.34 \times 10^{5} \mathrm{~J} / \mathrm{kg} \), densidad del agua a \( 4{ }^{\circ} \mathrm{C} \) es \( 1 \mathrm{~g} / \mathrm{cm}^{3} \).

body hanging by two strings and equilibrium \( T_{2}=60 \mathrm{~N} \) then \( w=\cdots \mathrm{N} \)