1. A student practises her tennis volleys by hitting a tennis ball against a wall. (a) If the 0.060 kg ball travels 48 m/s before hitting the wall and then bounces directly backward at 35 m/s, what is the impulse of the interaction? (b) if the duration of the interaction is 25 s, what is the average force exerted on the ball by the wall? 2. A ball of mass 0.075 kg is hung from a vertical spring that is allowed to stretch slowly from its unstretched equilibrium position until it comes to a new equilibrium position 0.15 m below the initial one. Determine the force constant of the spring- -*=0.15 m 3. Two amusement park "wrecker cars" are heading directly toward each other. The combined mass of car A plus driver is 375 kg and it is moving with a velocity of +1.8 m/s. The combined mass of car B plus driver is 422 kg and it is moving with a velocity of -1.4 m/s. When they collide, they attach and continue moving along the same straight line. What is their velocity immediately after they collide? 1Communication 1. A 0.150 kg billiard ball (A) is rolling northwards toward a stationary billiard ball (B) at 10.0 m/s. Ball (B) has the same mass as Ball (A). After the collision, ball (A) rolls off at 7.7 m/s at an angle of 40.0' clockwise from its original direction. What is the speed and direction of ball (B )after the collision? 2. Could a slow-moving truck have more kinetic energy than a fast-moving car? Explain your answer 3. a) Determine the magnitude of the energy change produced by the force illustrated in the diagram. 20-. Force: FIN) 10 20 Position: d (m) b) A stone is dropped into the water from a bridge 45 m above the water. Another stone is thrown vertically downward 1.0 s after the first was dropped. Both stones strike the water at the same time. What was the initial velocity of the second stone? Assume the acceleration due to gravity is 10 m/s? for this question.Thinking (All questions are of 4 marks) 1. A spring with spring constant of 75 N/m is resting on a table. a) If the spring is compressed a distance of 28 cm, what is the increase in its potential energy? b) What force must be applied to hold the spring in this position? 2. A truck with a mass of 2.00 x 10'kg is travelling at 80 km/h. If the force of static friction between the tires and the road is 8.00 x 103N (backward), determine the stopping distance of the truck. 3. . A simple pendulum, 85.5 cm long, is held at rest so that its amplitude will be 24.5 cm as illustrated in Figure below. Neglecting friction and air resistance, use energy concepts to determine the maximum speed of the pendulum bob after release. length = 85.5 om 24.5 cm 3Application (All questions are of 4 marks) 1. A 6.0 kg block is falling toward a spring located 1.80 m below. If it has a speed of 4.0 m/s at that instant, what will be the maximum compression of the spring? The spring constant is 2.000 x 103 N/m. 2. A 500kg satellite is to be placed into a circular geosynchronous orbit around the earth. The radius of the earth is 6.38 x 10*m. a) What is the radius of the orbit? b) What is the gravitational potential energy of the satellite when it is attached to its launch rocket at rest on the earth's surface? c) What is the total energy of the satellite when it is in geosynchronous orbit? d) How much work should the launch rocket do on the satellite to place it in orbit? (G=6.67 x 10-1, Mass of earth = 5.98 x 1024) 3. A toboggan is initially moving at a constant velocity along a snowy horizontal surface where friction is negligible. When a pulling force is applied parallel to the ground over a certain distance, the kinetic energy increases by 47%. By what percentage would the kinetic energy have changed if the pulling force had been at an angle of 38" above the horizontal