A 0.2 kg tennis ball moving at 10 m/s collides elastically with a frictionless wall at an angle of 30 degrees: 30 CY a) What is the speed of the tennis ball after the elastic collision? b) What is the angle alpha with which the ball is reflected from the wall? c) Find the magnitude of the impulse that the wall applied to the ball. Problem 2: Sliding and Colliding Consider a frictionless track ABC as shown in Figure P9.26. A block of mass m = 5.00 kg is released from A. It makes a head-on elastic collision at B with a block of mass m2 10.0 kg that is initially at rest. Calculate the maximum height to which m rises after the collision. 5.00 in 20 B m6q C Problem 3: Center of Mass A water molecule consists of an oxygen atom with two hydrogen atoms bound to it (Fig. P9.43). The angle be- tween the two bonds is 106. If the bonds are 0.100 nm long, where is the center of mass of the molecule? H mo 16 atomic mass units WH - 1 atomic mass unit 0.100 nm 0.100 mm 58 53 H Problem 4: Moving on a boat Romeo (77.0 kg) entertains Juliet (55.0 kg) by playing his guitar from the rear of their boat at rest in still wa- ter, 2.70 m away from Juliet who is in the front of the boat. After the serenade, Juliet carefully moves to the rear of the boat (away from shore) to plant a kiss on Romeo's cheek. How far does the 80.0-kg boat move to- ward the shore it is facing?