1. During a snowball fight, a 0.15 kg snowball traveling at a speed of 20 m/s hits a kid in the back

1. During a snowball fight, a 0.15 kg snowball traveling at a speed of 20 m/s hits a kid in the back of the head. If the contact time is 0.08 seconds, what is the magnitude of the average force on the kid's head. 2. Object A is moving due Esat while Object B is moving due North. They collide and stick together in a completely ineleastic collision. Momentum is conserved. Object A has a mass of mA = 16.5 kg and an initial velocity of Von = 8.2 m/s due East. Object B, however, has a mass of m, - 30 kg and an initial velocity of voo = 5.2m/s due North. Find the direction of the final velocity of the two-object system after collision. (angle and direction) 3. A 1520 kg truck moving with a speed of 27 m/s runs into the rear end of a 1000 kg stationary car. If the collision is completely inelastic, how much kinetic energy is lost in the collision? 4. Two balls with masses 2.3 kg and 5.5 kg travel toward each other a tspeeds of 10 m/s and 3.5 m/s respectively. If the balls have a head-on inelastic collision and the 2.3 kg ball recoils with a speed 7.0 m/s, how much Kinetic Energy is lost inthe collision? 5. A 0.034 kg rifle bullet travelling at 290 m/s buries itself in a 4.4 kg pendulum hannging on a 3.4 meter long string, which makes the pendulum swing upward in an arc. Determinethe maximum vertical displacement of the pendulum (height). (9= 9.8 m/s) 6. The drawing shows a collision between the two pucks on an air-hockey table. Puck A has a mass of 0.26 kg and is moving along ht ex-axis with a velocity of 6.2 m/s. It makes a collision with puck B, which has a mass of 0.52 kg and is initially at rest. After the collision, the two pucks fly apart with angles as shown in the drawing (a= 64 and B= 30%). Find the final speed of puck B. At rest Before collision After collision 7. A billiard ball is shot west at 2.3 m/s. A second, identical billiard ball is shot east at 1.2 m/s. The balls have a glancing collision, not head-on collision, deflecting the second ball by 90° and sending it north at 1.55 m/s. What is the angle that the velocity of the first ball makes after the collision, with respect to the west direction. 8. A hockey puck of mass 0.44 kg is shot east at 2.1 m/s strikes a second puck, initially rest, of amss 0.56 kg. As a result of the collision, the first puck is deflected at an angle of 39° south of east, with a speed 1.45 m/s. What is the speed of the second puck after collision 9. An object (A) of mass mA = 30 kg is moving in a direction that makes angle of 70° north of east with a speed va = 5.15 m/s, while object (B) of mass me = 16 kg is moving due south with a speed Vo = 8.05 m/s. The two objects collide and stick together in a completely inelastic collision. Find the magnitude of the final velocity of the two-object system after the collision 10. An explosion breaks a 21 kg object into three parts. The object is initially moving at a velocity of 30 m/s due. Part (1) has a mass m1=5.1 kg and velocity of 58 m/s due west. Part (2) has a mass m, = 5,4 kg and a velocity of 68 m/s due north. Find the direction of the velocity of part (3)?