11 Multiple Choice 1 point What type of energy is due to an object's motion? Elastic energy Thermal energy Kinetic energy Potential energy Multiple Choice 1 point Mechanical energy is defined as the sum of which two types of energy? Potential and thermal energy Kinetic and potential energy Electrical and chemical energy Kinetic and thermal energy

3.1 A truck with a mass of 1 ton is moving at \( 80 \mathrm{~km} / \mathrm{h} \) on a horizontal plane and braked to rest over 40 m . Calculate the following: 3.1.1 The deceleration 3.1.2 The braking force

9. A 0.13 kg puck is moving in a circular path on a horizontal air table where friction is negligible. The centripetal force is provided by a cord 0.68 m long attached in the centre of the air table. If the tension in the cord is 2.5 N , what is the speed of the puck?

A 63 kg student is on a 15 m diameter Ferris wheel rotating at a constant rate with a period of 18 s . What force does the seat exert on the student at the bottom of the circle?

4) Dos puntos, A y B, están en la misma horizontal separados por una distancia de 400 m . Desde A parte del reposo y hacia B un movil con una aceleración de \( 1,8 \mathrm{~m} / \mathrm{seg} \). S.multaneamente y desde B, parte hacia A otro movil con una rapidez inicial de \( 4 \mathrm{~m} / \mathrm{seg} \) y una aceleración de \( 2,8 \mathrm{~m} / \mathrm{seg}{ }^{2} \). Calcular donde y cuando se encuentran.

A car with a mass of 800 kg accelerates uniformly from rest to \( 100 \mathrm{~km} / \mathrm{h} \) for 8 seconds up an incline that makes an angle of \( 30^{\circ} \) with the horizontal. The frictional resistance is 280 N . Calculate: 3.2.1 The work done against the frictional force when the velocity reaches \( 100 \mathrm{~km} / \mathrm{h} \) \( \begin{array}{l}\text { The work done against the gravitational component parallel to } \\ \text { 3.2.2 the plane }\end{array} \)